1) Make sure you have a good handle on tax status and junior liens. This should have been part of DD but if you missed it, do it now.
2) When the hard copy collateral arrives, review it and make sure you have the original note and complete AOM and Allonge chains. If anything here is amiss you should contact the seller immediately to resolve it. Assuming all is well, you will need to arrange to have any dry AOMs recorded, including the AOM which assigns the mortgage to your business entity.
3) I recommend getting a field call scheduled so you can get a fresh read on the occupancy and condition of the collateral property. If the property is vacant, you will likely want to hire property preservation to get it properly secured.
4) Beyond that it is a matter of working your exit criteria, i.e., making contact with the borrower for workout or DIL. I generally begin FCL out of the gate to get the clock ticking and provide motivation to the borrower. It can always be cancelled if a better exit materializes.