locking in a cash-buyer when you haven't made an offer on the house ?

[Eli Hood]

I'm a bit confused again, which is kinda preventing me from moving forward in real-estate investing, lets say i saw a property and i wanted to do transactional funding, do i make an offer on the house first or do i find a cash buyer first before i make an offer on the house. Which one comes first if i wanted to double close ?