Starting New Business

I have been thinking of starting a small business on the side just doing car audio. I have been doing pretty good just installing out of my garage and I would also like to start selling a few of the actual products I am installing to the customer. I have already have a line on the product but what I'd like to do is set up a sound board where I could install a few amps head units and subs the structure itself I am in the process of building, and I already purchased a power supply. My question is, what other parts am I going to need other than a power supply that allows me to switch from one product to another and where do I buy this from? I know I can purchase these through my supplier but they seem to be a little high for what I need. Any help is greatly appreciated!!

I would suggest on rolling on down to your nearest Best Buy or Circuit city, and asking those guys.  Most of the real sales people know what they are talking about and can point you in the right direction.

--mindctrl