first time..im ready...just a lil advice please

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hello,
i preatty mutch know what im supposed to do is get a deal put it under otract which i bougt at my local office depot. and then call a buyer and sell it. my question is when i go to the seller with the contract do i sign as the buyer? becasue im going to wholesale it to another buyer or do i sign everything and make another contract with the next buyer or and sell it for more then i bought it for and take my money and give the seller that originally sold me the house his money? plus who pays the closing fee me or the seller or the buyer who im going to wholesale it to? please give me as much advice as possible it will be really apretiated
Thank You