Some questions: how much of a run are you doing on each set? (5 of each, etc)
Advice - use JPEG as your picture format. bmp (bitmaps) take up a lot of memory and load really slowly (even slower with a dialup connection).
The best place I've seen to sell sets is a BrickFest - as people bring money to spend there, and like getting few-of-a-kind things.
Lastly, don't be humble about your custom set - if you don't think these are good, don't bother going through the trouble of gathering the pieces and selling them. And telling other people that you don't think they are good is fishing for compliments, and won't attract buyers.
good luck with this.
"The sound of laughter is like
the vaulted dome of
a temple of happiness. "