to help with apparel vinyl pricing i would suggest Rogers calculator
www.heatpressvinyl.com ( it's on the left close to the bottom)
On transfers i always try & double what they cost me....
Outsourced screenprinting would depend on what your printer charged you & then mark it up to meet your needs ( 20-35%) or whatever you feel comfortable with....
As far as commissions per shirt - that would depend on how much it cost to produce verses how much your selling them for....I have some of mine in stores & they make about $5 per shirt sale & they seem happy with it...
Hope this might help out some, but remember i live in rural Texas so you may be able to get more or maybe less depending on where you live & how much competition you have around