Four have always drug me back to them. Putting up spoiler here just because I'm going to actually delve into a couple of these a bit and want to be on the safe side.

I'd love this. Get some relevance back to our ships and make it feel a lot less lonely.

Zakuul and Korriban.

Ffon from the SI prologue, would've happily taken him as a slave over Khem.

Veeroa and Senya are currently my two favorites with HK-55 bringing up the rear.

Cytharat would be one I would love to see again.

If I remember correctly, they stated that companion quests would now advance with the story, rather than being based off influence.

Datacrons have become legacy bound I believe (at least the ones without the shards) so it sounds like you are trying to re use a datacron that you have already unlocked for your legacy.

I imagine that the home planets are set up similar to how the starter planets were (meaning no actual storyline but a bunch of missions in each zone) so you may find some purple ones for the planet as you progress.

the 12xp will only last until level 55, at that point it is meant to revert to the normal level of xp gain.

Looks awesome and would love to see my warrior decked out in it, so definitely supported.

I'd say HK works well with sith characters as well as agents. Depending on what kind of smuggler or bounty hunter your using, he can work well with them as well, though I would still say sith and agents are the better option. Treek makes, arguably, the most sense with bounty hunters and smugglers. However, due to her merc nature, most can easily work well with her. The only exception I'd make would be in the case of trooper, though even that can be worked around.

You can start up the expansion quests (I assume you already have the expansions) through a mission terminal on your ship. As for PVP, I might recommend just playing a couple random matches to get a feel of how your toon plays now.

Blood Hunt is a part of the SoR story, continuing along the Rishi quests will eventually get you there. You will later come along another flashpoint outside of Rishi Village (I believe that's the place) that one will also gain a mission from the main story line before entering.

Upon reaching max level, you would typically do daily areas (you get leads to some of the worlds that would follow under this category), pvp, or Flashpoints/Ops (using the WoW example, these would stand in for dungeons/raids respectively). There is also the option to RP, if that is something you are interested in getting into of course. Without the current expansions, you might find a lack of interest in some of the older flashpoints and operations, but it shouldn't be impossible to find some interest for them.

2. Nothing really different happens, other than you are starting mostly (if not completely) from scratch on that server. 3.I'd imagine nothing happens if you delete all characters, though I could be wrong. Good rule of thumb might be to just make sure you have at least on character in your legacy at all times, you can always shuffle them around if you want to replace the character at any time. Your other two questions, I have no idea about myself.

I could be wrong, but I don't believe there is any option where you find a body at the end (this is mostly from what I've seen various others discussing the Agent storyline say anyways).

I don't believe there is anything that really tells you, though sometimes you'll get a reference in the mail or through later dialogue that will hint at what you chose (though this is usually with the instances where you choice involves whether or not a specific npc lives).

For the guild idea, I would say go for it. I've never really heard of a stronghold focused guild before, but there are bound to be some people interested in the idea.

Unknown as of yet. It's possible that some of the rewards will eventually become available to the Cartel Market, but I wouldn't expect to see them there for a while, if at all.

I can't say much about pvp, but if you want an escape procedure, something like the Sin would be useful with the force cloak ability (auto stealth while in combat does come in handy every now and then).

Adaptive gear, generally orange gear, almost any armor or weapon you may get from the Cartel Market falls under this category. This gear generally comes without stats and allows you to constantly update it as you level through mods. You can also purchase these from the GTN (Galactic Trade Market). The mods you can get from a mod vendor on most (if not all) planets, generally they will be in the town that the spaceport is located in, or from the supplies section of the fleet.

Generally speaking you'll be fine just doing the story missions as a subscriber. However you will need to try and upgrade your gear with mods every other planet or so. I would suggest getting some adaptive gear (if you don't have any already) for both your toon and your companion if possible. If you are almost done with your current planet, I would hold off until the next to purchase the mods.

Depending on everything involved in kneeling and the situation that landed us in that position, most of my force users would probably kneel. My Agent would probably refuse and then start running for the nearest escape route. Bounty Hunter would ask for the pay and then at Mako's disapproving frown, start shooting. Trooper would demand that he surrenders "In the name of the Galactic Republic". Smuggler I could see going either way really, it would depend on how his little criminal empire would work with Valky.

I believe you are thinking of the galactic armor pack (I think that might have been the name) that was out for a little bit. If you are looking for it on the Cartel Market, it will probably show up again in a month or so (I'm not entirely sure how they go about rotating the special packs like that). Typing Galactic into the GTN should also bring it up if anyone is selling some of their left over packs.