1) Sleeving depends on what gauge wire you use and how tide a braid you use. In general, for the sort of standard 24awg wire in polyethylene in a compact 4-wire braid, I believe 5/16" is what I used to use (although it has been a while and someone else should also chime in).
2) Lunashops.com. Takes a while since it is located in Hong Kong, but they carry just about every connector possible and most are well priced and of good quality.
Thanks a bunch for your help FraGGIer