Before you try to put everything together at once, IMO first you should contentrate on one aspect (e.g. programming or production).
If you can offer cart, box, manual etc. productions at reasonable prices you will find lots of people who will use your service. And then you get in contact with programmers, designers etc. automatically.
But before you start, have a look around what is currently existing. There are lots of homebrew programmers (e.g. click on my sig ), and various people offering cart production service (incl. AA).
good. Maybe I can do my own games, and ask somebody to put it on a cart. I intend to start my Colecovision programming as soon as possible, and after try programming to other consoles. If I get there, it will be amazing, have a game written by me