Welcome Inferdragon
I returned after a 7 year hiatus and I'm really enjoying myself, I even managed to get 4 friends to join me and 2 weeks after returning we're all now subscribed and utilisiing voice chat whilst we play which is really enhancing our experience.
There's plenty of good guides out there such as SWTORISTA and VULKK, you won't have to look far to find all the answers you need the SWTOR forums and SWTOR reddit are usually good fallback options too.
Good luck!