You're only level 16. Being new to an MMO will make this feel like a bit commitment, but in the long run, it isn't. Don't worry too much about what your toon looks like now, as every level you'll be replacing gear anyway. Going for the orange type gear to keep the same look is a nice aspect of the game, but not really one to worry about first time through imo. The GTN is there to get you the pieces and schematics you're missing but you'll burn through a lot of credits that way too if you do it while you're leveling. You can't have your imperial toons support your republic toons and vice versa.