First potential Deal- Need some advice

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Hi everyone, 

I'm meeting with a very motivated seller today. We both agreed on the price on the property and we just need to sign the contract. This is my first deal so I feel a bit nervous and excited. I'm using a form from Steve Cook's course. 

Should I sign the contract under my name? or Should I use an LLC? Would this affect the way how my profits would be taxed? What should I do after signing the contract? Any general advice would be greatly appreciated.

Dan