Wholesaling houses. Where to start and the Process?

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So the process from my understanding is, you find houses that are about to be foreclosed, walk up to the door and say "I want to buy your house." You make a offer on what you want to buy it for and write it up in a contract, and then try to sell it to a house flipper or just anybody who wants to buy it as fast as posable. Is that pretty much the process generally speaking? Ive also heard of doing a double escrow can anyone explain how and what that is? thanks.