I think that when you have that kind of variety you can definitely make some interesting choices. In some ways it comes down to picking the best crew skill for your class
, as well as figuring out how you want to want to make your money.
The first step is to identify your niche... who do you intend to sell to? Is it other crafters and getting base materials to them? Is it everyone else and trying to sell augments? How do you like to play... PvP, or PvE? If you ever looked for something specific and thought it was annoyingly expensive, thats a good place to start. There is no 'best' way to make credits by selling stuff to other players. The more that happens, the more people do it, and the less value that action becomes.