Great question!
If creating a startup, why would you need a resume?
For now let's assume you're looking for a side job and want to use this as experience...
Focus not in what thresholds you might have accomplished but the route you took to get there. For example, describe your ability to effectively communicate a problem and direct a team to develop and implement a solution. Or the number of sales you have generated for the startup ahead of expectations, web design abilities, etc... Unless is a well known brand no one cares if you simply list: "launched a start up company that did x" what recruiters want to see is the applicable value you bring to their company for your applicable job description...

-Humberto Valle