A guru called this gator lending but I would strongly advise against borrowing funds for a down payment.

Any recommendations on lawyers to talk to that can assist in advising on an LLC fund (if needed) and how? 

And also I inherited the tenant and havent signed lease with them been advised to better honor the same terms of the seller until their contract finish.

Readers are advised to seek professional advice.

The Mexican corporation, generally advised if you buy multiple properties, given the higher costs.

Readers are advised to seek professional advice.

Your clients should focus on properties with significant equity potential and work with experienced contractors to stay within budget and timeline—especially with borrowed funds on the line.Avoiding Bad Deals - Encourage them to work with experienced agents, contractors, or mentors and always run multiple scenarios, including worst-case outcomes, to stress-test their numbers.Reserves - Advise your clients to keep a reserve fund separate from their loan for emergencies, unexpected expenses, or delays.

Readers are advised to seek professional advice.

Readers are advised to seek professional advice. 

Other than just those things I would advise that you contact the IN attorney general office.