Personally I would just get the proper licensing and insurance if I wanted to manage properties for others. 

I would recommend anyone lending in this environment to fix and flippers or any type of investment to be careful and get a personal guaranty and make sure person has a long track record.

I have no idea who I should reach out to for help, and I just do not understand how this person no longer responds to emails or returns phone calls.I hope someone can provide some guidance. 

I think of it like an employee or personal assistant.

If I understand correctly; the seller would receive 80% ($40,000) directly from the mortgagee at closing and would enter into a personal agreement with me for the 20% down payment ($10,000) in which he would be reimbursed separately from my mortgage payments at a separately agreed upon rate and term?

Unless you revise your plan and ensure that your personal use is under 10% of the rental use.

Single family homes are exempt from rent control everywhere in the state.  

I had the initial call with a PadSplit sales person, but I wanted to talk to somebody who's actually doing it to get their perspective and advice.

It can be a very good market, but the why behind your choice may help us give you better advice on how to move forward.Before realtors and property managers, you really need to meet other investors so you are making a good move by trying to do that here, but it would be better if you could do it in person.

Since your property has high resale potential, some lenders may be willing to work with you.Cash-Out Refinance – If you’re open to refinancing, you could take out a new mortgage for a portion of the home’s value (say, 60-70% of the $500K), and use the cash difference for renovations.Personal Loan – If you have good credit, you might qualify for a personal loan for part of the rehab costs, though interest rates are typically higher than secured loans.Partner with an Investor – Given the potential profit, you may be able to find a real estate investor or contractor willing to finance the rehab in exchange for a share of the profits upon sale.Your best option depends on your financial standing, timeline, and risk tolerance.