In a classic capitalist model, you need to identify everything that will make the business viable.
Non-financial contributions need to be converted to financial equivalents.
Then you need to be clear about who is bringing what to the pot.

Finally, and this is particularly valid if there is a lot of non-financial contribution in the beginning, there needs to be a clear understanding of what happens if the project gets stuck at any stage.

Relating to a possible scenario knowing something of your background:
Someone brings concept.
Someone else engineers the concept.
We reach a stage where hard cash is needed and it is not forthcoming.
What then?

To pop out some thought prompters - clarity, commitment and parachutes.