I need help making a character In Star Wars Galaxies, Do you know if you can build droids and stuff and mine if your not a trader?  I want to be able to build things like weapons, droids,armor, But I like to fight also...Any Advice?

In order to construct droids, you need to roll an Engineer trader. Any profession can use a droid, although some are specific to particular professions.

Any profession can mine for resources and plant harvesters, but the trader professions have a better stats for sampling and range.

There are four trader professions - Munitions (weapons & armor), Structures (architect & shipwright), Engineer (Droid & Artisan) and Domestics (tailor & food). A character can only be of one type of trader or ground combat profession. Each server allows two charcters (max of eight charcters per account). 

Since you want to craft and fight, You could select one type of trader that seems to suit you the most then the other character can be your 'fighting' profession of choice.