If I have ideas for stamps.....

I would try to go through someone in the industry, b/c unless you have the equipment/technology to take the stamps all the way from idea to production, and the marketplace to sell it, you may find yourself either inundated with orders you can't fill or left with product that doesn't move.

Not sure who that someone would be. Maybe one of the people who has just recently jumped into naming their brand, like Kelly Klapstein, or Vicki Boutin. Bet they could give you advice, and I think either one could be trusted--at least they have worked with people who still trust them.