You have to be decisive. Indecisiveness is a startup killer.
Stay focused and don't try to do too many things at once. Care about execution quality.
Losing focus is another way that founders get off track.
The company just needs to see you as like this maniacal execution machine.
I care much more about the growth rate of the market than it's current size and I also care if there's any reason it's going to top out.
In the beginning of a company, there is no management and this actually works really well.