Are you really ready for this?
With that being said, you should pick characters that play to your strength and your own idea of fun. Obviously, a person who likes to be right in the middle of action, should pick a melee character since it will augment his own sense of enjoyment as well as play style. On the flip side, someone who rather sit in the back and leisurely pick people off should go for a ranged class. Those who are a little more tactical or adventurous can try a "hybrid" class where they can engaging both on the melee front as well as ranged. Keep in mind however that with every strength of a characters comes a disadvantage. Knowing these disadvantages will affect how good of a player you are and frankly, how "bad ass" your character will be.
Now that you're here, what will you do?
A Guild and Why It's Important: Now, you know all those motivation posters that tell you "success is in the journey and not the destination?" Well, it's true but a journey into the unknown can definitely be a frightful thing. Imagine the RPGs of the old, where you would walk into an area and get instantly killed by a bunny (FFXI, I'm looking you!). Wouldn't you rather have someone there with you to tell you not to go into that forest...or better yet, to help shoot that darn bunny while it was taking a juicy bite off your arm? I know I would and in fact, I would rather have a "Han shoots first" attitude where multiple of my allies unleash a barrage of unrelenting laser fire into that innocent looking "bunny" before it can even get near me.
Well, that is what guilds are for. Finding the proper group of people who can get your back will not only make the game easier, but will also be more fun socially. Keep in mind that this is a Massive Multiplayer Online game where this is definitely possible so why not take advantage of it? Discovering the right guild takes time, but when you found the one guild where you can build a sense of camaraderie, there is no other feeling like it in the world. Whether teaming up to take down a Master Jedi/Sith or simply hanging out and chatting about your adventures, the galaxy will be much less lonely with allies at your side.
The journey is better with friends...