Hiya guys!

So here I am. I really want to build computers (custom) for people. I have an associate that would help, and I would plan on ordering parts from newegg. I'm pretty good at it, and I believe there could be some good money, as well as fun, in it. What I ask you, is what advice could you give me on places, and ways, to sell computers? How should I start up without spending (if possible) much money? How should I require payment? (aka upfront, or I front). THANK YOU very much for ANY help or suggestions.