I would appreciate your comments on the following.

I have been shooting local SCCA races (road race) at a local track, on a freelance basis. I post selected (small/low res) photos on their website.

I have received an inquiry about selling a photo I took, from one of the drivers. This may start a trend.

1) I have capacity to print 4x6, 5x7, and 6x8 Dye sublimation (Hi-Touch 730ps)
and 8.5 x 11 Inkjet (HP 7960)

My question is basically what do I charge per print (each size)?
Also what do I charge for a CD with electronic files?

Any and all suggestions are welcomed.