Make sure you talk to a Banker or Loan officer that is well versed in both SE (Self Employed) income and also Non/QM programs.One tip I will give you as a Banker is open up a "Business Checking account" and for the next 12 months pay "Everything" out of that account. 

Using a large RV or boat for business purposes offers potential tax benefits, but it's essential to navigate IRS regulations carefully.

Any tips?

I think that could be dangerous if people are not careful in their evaluation. 

Budget carefully, prioritize high-ROI renovations, and adhere to strict timelines to maximize profitability.

Be super careful.

I have had a couple of clients just get the loan approved with the long term rates and then the bank really doesn't care how they get it rented out after.

Do you have any beginner tips for someone attending judicial tax sale which is supposed to be "free and clear" of liens?

Any advice or tips would be appreciated.

@Nick Henry this also comes down to how much time you have available and how much effort you are able to put into purchasing a home or building and doing renovations and then finding quality residents to live and take care of your asset.