I work as a Small Weapons Dealer. I take down raiders and scum while searching derelicts and areas of interest. Once i got a collection of 100% CND weapons i sell them to a variety of high money traders, especially the Gun Runners, and build up a large collection of caps (On average i've got about 7000 in my inventory and more saved up at my places such as the Hotel Room in Novac)
I enage my enemies usually from a distance with a variety of rifles. If i want up close i use SMGs and the light machine guns.
My SPECIAL usually i use max. intelligence so i can level up my stats quicker and a lot of my initial perks i use intensive training to improve my Strength, Luck and Agility.