I live in Maine where short term summer rentals are in huge demand.

By forming a property management company, you could deduct business expenses like office supplies, software, and possibly a home office, which you wouldn’t otherwise be able to claim.

The PO Box mainly won't get used but in future I plan to use the address with any tenents.

you will have to put some time in. also, not your main question, but: wholesaling is spectacularly difficult. 

The supply of homes for sale around the three county area of Sacramento has risen for the 8th month in a row.

I'm hoping this leads to me avoiding a lot of those early mistakes, but we'll see how well that actually holds up.The main thing I am excited about with Bigger Pockets is hearing opinions and thoughts from a wide array of people.

Then do a cash out refinance and move onto the next.But my main focus is HOW am I going to expand fast to achieve my goal?

This is in line with the expected seasonal trend and probably correlated to the rent increase in September.Rentals - Months of SupplyThe supply for our target rental property profile stands at about 1.4 months, slightly down year-over-year.

My main goal?

For the remodel I am thinking of extending the main home (which would make it "L" shaped") to incorporate the detached carport and detached bedroom/bathroom.