The idea should come first, the startup should come second.
One of the biggest advantages that start ups have is execution speed and you have to have this relentless operating rhythm.
If you want something in a deal, just ask for it.
You have to be decisive. Indecisiveness is a startup killer.
Companies that I've been very involved with, that have had a very bad first hire in the first 3 or so employees never recover from it.
More important than starting any startup, is getting to know a lot of potential co-founders.