Real Estate Option

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I'm new to the real estate game. I have read numerous books and have almost no money to risk, so have decided that I have to start with straight options. I haven't been able to find an explanation of how to close on an option. Since it is fraudulent to sell a house that you do not hold the title to (isn't this a "double closing"), I understand that you can assign your option to the buyer you have found. What then? Do they just write you a check for thousands and them are on their own? Since this type of investing is considered unconventional, I feel that I must understand it completely before I try it. I have been advised that you can do a socalled "double closing" but an very leery of this. No one seems to have a good play by play of how the closing actually works.