Two ideas written up, both need funding one benefits me other benefits everyone what to do?

So here I sit with two business ideas jotted down, one requires a large engineering and or physics background to have it looked over to see if the concept would work and if the technologies are available to advance it. If the theory is sound just a matter of fully designing a worthwhile system. Thought of it one day after some events and thought is it such a simple concept would it work but then started projecting possible vectors for it I wondered if it was something worthwhile to brainstorm with. This would benefit everyone in certain regions.

On the other side of the ledger sits one that would benefit me, frankly don't care but it might act as a infusion of capital to attempt to startup the other idea. So win/win either way just a matter of which comes first the horse or the cart? The second concept is more inline of what I know so the technicalities and difficulties would be easier to project and amend but just needs polished and revised in structure with some details worked out. I theorized enough of it upto a point but some other background management would be needed.

Oh well