I'm sure you've already heard this from other experts, but rest assured, you're not the only one that goes through this dilemma. Here is my advice: set expectations early, get an agreement and document it on paper (either formally through an Operating Agreement or informally like a Team Charter).

I always recommend getting input from the rest of your team to help shape your vision. Be genuine when asking for their opinion. Do consider that there will be times where your co-founders may have more subject-matter expertise then you. Solicit opinion, value their feedback and make the decision.