IMO, get a Hauler and do missions ferrying goods, that should earn you enough for an Adder which can do more of the same or you can fit it for a bit of pewpew. I just did more haulage until I could afford a Cobra, thats a great multipurpose vessel for you to work out how you want to play.
There are other schools of thought tho. Some people head straight to Viper and just settle in for combat.
Cool, think I've got enough dosh for a hauler already.