I have never seen any financial statements or documents or 3rd party audits etc.  

This might depend upon your license, if required.Loan Document Costs: Will you charge for these?

.), but it's WAY less document intensive than a conventional loan. 

I'm looking for the cleanest & most visible way to access payment history, see amortization schedule, tax documents, etc- much like bank softwares provide. 

If I am self managing my portfolio, what do I need to check/confirm, and what easily available tools are at my disposal (online, other) to help me do this? 

Seller should record their lien against the property, you both should have an attorney review to make sure all interests are property documented and protected, and i think everyone is in a good place. as far as evicting tenants... this is up to what you and the seller can negotiate. i would still be putting on the same contingencies - appraisal, inspection... know what you're buying. don't get blinded by the seller-finance piece. 

Are you taking it online as a self study, or are you in a class with a teacher?

If you now want to or have to sell, you need proper documentation from your purchase, you may have an uncooperative original seller, maybe you didn’t get title insurance and there is a problem and so on.

That being said, I had to translate a lot of documents on my own for the loan process, so there was more effort involved.

In solar sales (door to door) the setters typically make about this same range.Most companies in the house flipping world seem to buy lists online or run basic skip traces of areas and send lists to VAs to setup calls with the owner of the company.