You have the mortgage, taxes, insurance, maintenance, capital expenditures (roof, flooring, etc.), and also need to consider the cost of vacancies or bad tenants.I also recommend you charge market rate, for yourself and the tenant.

Yes, you can deduct related expenses including gas, loan interest, insurance, etc. using the actual vehicle expenses method to deduct auto expenses for your rental or other businesses. 

Got insurance involved and use that money to remodel the entire inside, and add a new roof.

For the BRRRR process I plan on using a hard money lender for the rehab process for the SFH's but what I'm not sure of is, should I purchase a duplex and rent one unit out and live in the other or should I just rent for now, not purchase a duplex and just purchase a SFH with cash and start BRRRR'n immediately?

I've found no investable thesis during this time--my plan was and still is to watch it crumble from the sidelines and then get back in after a bottom has been somewhat defined.A little over a year before the market collapsed I started selling--and during that time I sold 3/4 of my portfolio. 

I just set up my vrbo account and still some finer details about planning the communication, cleaning service, maintenance persons, etc…

There is plenty of tax planning opportunity with a property type of that size. 

To make a new property cash flow with current prices, interest rates, taxes, and insurance, you're putting at least 40-50% down.

I have one property at the moment, but plan to expand my portfolio. 

Prices are through the roof, Insurance cost have skyrocketed, maintenance cost are up a lot, taxes.