THANKS for your help. I guess I should say I need help with collage
design,
not how to do collages. I am never satisfied with how my collages look.
( maybe it's just the poor photography : ) )

Not sure what you mean by collages. If you mean a cluster of small
photographs, I would suggest not doing them. There's no money in
selling small prints.

some folks sell on a per print and size basis, others on the number of pages
in the book, then you have a bunch that just give a CD or a stack of paper
prints to the client and leave them to figure it out themselves.