To address this I took detailed pictures from beginning to end of my most recent flip, documenting that we did a thorough job using quality materials.   

I'm use to a move-in inspection documenting the condition of everything at time of move-in. 

In addition, we pull our own comps and use Lightning Docs to generate our loan documents.

Rent payments from the medical LLC are fully deductible as a business expense, while the property-owning LLC will report the rent as taxable income, which can be offset by deductions for expenses like mortgage interest, property taxes, maintenance, and depreciation.To ensure compliance, document how FMV was determined—using market comparisons, an appraisal, or similar data—and draft a formal lease agreement outlining the terms, rent amount, and responsibilities.

A relative who does long-distance real estate investing told me that I have to sign the final loan document and the transfer of ownership document in person.

They are familiar with you and can give you direction and documentation.  

Once you get around 50 doors, then I would look at documenting policies and procedures.

Proper documentation ensures you’re prepared to substantiate your claims.Federal REP or STR material participation allows you to deduct rental losses against active income, significantly reducing your tax liability.

However, there are multiple documents that emphasize that all 1245 property determinations must be factual and supported by corroborating evidence.

Here's what I'd do: Create a Word Document or Google Document Titled "DRAFT: Life Vision" do not use a template, do not pay some guru for this.