I'm not saying you SHOULDN'T have that be your first costume, I'm just saying it's a difficult one to tackle. If you only have money for one costume in the near future, then by all means, build the one that is your favorite. If you want to cut your teeth on something a bit more simple first, then a TK, TB, or TIE pilot are good ones if you want to have a full helmet type of costume. Otherwise, starting with an Imperial Crewman is always the simplest and cheapest to start with, and is also the base layer for the TIE pilot, gunner, and Navy trooper.