I was doing Rage through most of my levelling pve up to about 40, then I decided to switch to carnage for something different and it's been pretty good so far, at 49 and have been doing fine soloing all the normal missions and class missions. I'm no expert on this stuff I'm just going with a ready made build and it works. Try it yourself and see how you like it and go from there.

While that's certainly true and by definition any MMO is a multiplayer game... However, I noticed a couple things since joining this game recently. 1) There are a ton of servers available to choose from which probably is spreading the available player base pretty thin, I haven't seen many other folks on the server I'm on. 2) And this has been mentioned by some players in any MMO that I've been on, some of us play weird hours outside of the more popular busy times and it's not always easy to find folks to team up with at those times. Solo'ing is more of a way of life for some of us who play, not necessarily because we want to but because most of the time that's the only option. Just sayin'....

There is a guy on Coruscant right next to the Senate Taxi station who can give you a quest to talk to a guy next to the smuggler trainer that gives you the advanced smuggler training.