Hours flown per year has nothing to do with how many pilots you need. You need to get an idea of how many flying-work-ron nights per year.....and with 5 partners my guess would be 365.

Plus you will manage everything? What kind of plane are we talking? Doing Intl flying? Shopping fuel, managing expenses, paying bills etc? Its a full time job.

Big question also...got a good mechanic/tech? Who is going to babysit mx?

Anything hollow like "we will get a 3rd pilot or contractors as needed later, etc etc" is 100% worthless and should be treated as such. Get it all coming in the door or its gone. Planes run on budgets, stay in control of yours. Leave room to breathe.

Overestimate....because new owners (and 5 of them??) always, always underestimate their flying....

Good Luck to you!