Making dark chocolate at home
Sorry to rain on your parade, but making good quality chocolate in a home kitchen without special equipment is basically impossible. 

The magic tool is a conche - a machine that grinds the cocoa solids so finely, that you can't feel them with your tongue any more. We are talking about a particle size of 10-20 micrometers here. It also distributes fat and sugar in a very specific way. At the same time, temperature rises in a controlled way, altering the flavour profile of your ingredients. For very high quality results one batch took up to 90 hours. Modern technique recently brought this down to an hour or so for good results, provided the chocolate mass is pre-treated to remove unwanted aromatic compounds. Note that we are talking about an industrial scale here, small-batch conches still need 12-24 hours.

The bad news is that even if you committed yourself to manually "conch" for hours, the results would probably be not very satisfying: the precise parameters (time, temperature, humidity...) are a carefully guarded secret of each manufacturer as they significantly contribute to the specific taste and mouthfeel of the brand.