The answer to this is always self capitalization is fastest + usually cheapest way to go.

Without more detail, no way to determine how best to direct you to design of this type of money flow.

Try searching Google for how similar products were self capitalized, or...

Get on the phone with anyone you know who understands self capitalization.

All my businesses are self capitalized.

And... I'm hooked on this approach, because of the zero wait time till first sales.

Waiting on money from anyone incurs a massive net loss in opportunity cost.

In other words, if it takes you six months to find $50K + you have to give away 75% of your business... you just lost...

6 months of sales + 75% of your business.

To me...

Better to start making sales today + keep 100% of your business.