You’re an entrepreneur trying to solve horrible problem X, usher in wonderful vision Y, or fix stagnant industry Z. Don’t mention your idea. Frame expectations by mentioning what stage you’re at and, if it’s true, that you don’t have anything to sell. Show weakness and give them a chance to help by mentioning the specific problem that you’re looking for answers on. This will also clarify that you’re not a time waster. Put them on a pedestal by showing how much they, in particular, can help. Explicitly ask for help.