Gold!! I have questions and need advice.

So I have been doing some research on gold but there are still some questions I need answered. I want to collect scrap gold (from circuit boards etc) and jewellery. I want to melt it down into pure 999.9 bullion. Obviously I'll have a hard time selling the gold if I melt it myself. So how do I get someone to melt and assay it without them taking most of the profit. Also can I use 9ct, 14ct etc to make a bullion? Basically once I accumulate the gold, how do I go from A to B??