Trust Agreement/interest Transfer?

Please help me clarify the problem: When the seller deeds me his house thru a Warranty Deed to Tustee? I can have the trust agreement with that trustee, or The seller can have the same trust agreement with this trustee. Let`s say an attorney is a trustee. Who is the owner-beneficiary? Who is the real owner? Deed is in trust, right so there can be 2 different trust agreements - with me and with the owner of the property? Right? Excuse my stupidity, but please clerify that?