Locating Sellers

[Andre Deville]

Hey, my name is Andre and I'm new to wholesaling. I pretty much got everything down except a couple things. I located a couple vacant houses that I am interested in wholesaling. Problem is I don't know how to locate the seller. I searched the address and on some locations I found a owner and name but no number or current location. Please if you have a better way please let me know.

Also after negotiating a deal and getting the contract signed whats next? Finding a buyer and setting closing date, sending contract to title company to see if its clear? is it officially my property after the contract is signed meaning I can go in browse and put a lock box on? please help
Thank you