Hi,

First off, it really matters what the idea/concept is on which you want your two teammates to work on. They can say they would go with whatever, but trust me when I tell you, the intrinsic motivation can very quickly disappear if the idea/concept doesnt resonate with them or they didnt buy into it.

I had just a case like this and it usually ends up in a failure, sooner or later.

So when you are talking to them about being part of the team and making them partners (share distribution should be proportional to planned or perceived contribution by each team member), make it very clean they need to buy into the idea or commit to it long-term (6-12 months).

Also to increase the chance of success form the beginning, make sure to get on your team few passionate team members who have complementary skills. Try to avoid have two or more team members with same or overlapping skills. This can create a competition and conflict of interest from the onset - and you dont want that to happen in your core team.

Also getting their commitment to work for free, as partners or core team members, will test their "faith" or how much they bought into the idea/concept. If they ask for money early on or are doing your project just as another 3 or more projects, that you should be treating them as freelancers or part-timers, rather then core team members or partners.