The regular model is that you need cash, so you go looking for it, selling (part) ownership.
In this case you have pre-determined the owners, and presumably their share %, so presumably they're putting up the cash.
Alternatively you can go with a non-ownership approach. Ie a loan. That'll vote either an interest rate, and usually dome collateral (which I guess also comes from the owners.) If you go this route I recommend you get a lawyer to clearly explain the implications of liability - one participant can easily be on the hook for the whole loan, not just their share of it. They'd be much better off taking small individual loans to "buy their share " than participating in a group loan.
Future admin work may also be affected by your governance model. There will be times when all owners need to sign, and you need to thus have mechanisms to strip ownership if the person leaves, or dies. Shareholdings which become part of their estate, and are inherited are a concern.
In short, you need a lawyer well versed in these structures. Not just internet advice.
I applaud your vision, but you need to think very carefully through all aspects of this.