A Reddit user, DarthRevan, created and shared a class selection flowchart to help us all out.
His post reads:
I made it relatively quickly in MS Paint, so I apologize if it’s not so visually appealing. It was meant to be functional, and is a first draft of sorts. I would love any feedback, and I might even revise it if people find it helpful with some tweaks.
If someone wants to make a flowchart based on gameplay & mechanics (which I also think will be very helpful), I invite them to do so because I admit a lack of expertise on that.
So without further ado: The SWTOR RP Class Selection Flowchart!
Edit: I also found in the process of making this chart that it is very difficult to find short statements that encapsulate the actual choices, which are more complex. I tried my best, though.
Edit 2: People also seemed to find my post on faction choice useful, too, so that might help you as well.