I'll take a crack at these...
1. Contract. You can find multiple examples here on Biggerpockets. https://www.biggerpockets.com/files/category/contr...
You can also use google and type in Northwest Multiple Listing Source Purchase and Sale Contract and find the one commonly used by many agents. Other investors use this, but may change is slightly to fit their needs.
I have one from a real estate attorney. I use it as it can also be used for owner financing agreements, lease options, as well as wholesaling.
2. Typically, when you get the P&S executed, you will forward it to a investor friendly title company that you have already contacted. They will open a file/account for this property as well as open escrow. Earnest Money is typically held by them.
3. See #2 above. Most wholesalers I have worked with will already have a file opened with a reputable title company. When I wholesale a property, that is exactly what I do.