A great deal of advice here is going to push you in the direction of VC funded startups and the Lean Startup style approach. You might want to go that way, but

A great deal of advice here is going to push you in the direction of VC funded startups and the Lean Startup style approach. You might want to go that way, but as you said "build", not "sell", you may value the approach of bootstrapping and taking a strategic view (e.g. following your convictions).