Making offer

Ok, so I actually bought a house two years ago and am now ready to get an investment property. Found a place I could be interested in (FSBO). Don’t know the process for making a formal offer since when I bought my primary residence the RE Agent did everything for me. Can someone walk me through the offer and acceptance process? What documents do I prepare, what documents are prepared by sellers attorney? What money do I put down, I remember have to give a check to seller for 1% of property value for that contract, but how does it work with a FSBO.