This might be a good way to get your feet wet
Wazoodle is a canadian company that sells diaper making supplies and other fabrics. They have a lot of services, and they sell these kits for making fitted diapers. Everything is pre-cut, you just have to sew it together. They have printed directions and a video on how to put it together.
I just ordered some smalls and more elastic. I have a bunch of one size pockets that I made when I had my DD, but I wanted to do some small fitteds and covers as well.