We had one tent camper group as our first guests, then have an RVer couple who are about 17 days into a 22 night stay, and three other bookings over the next month.  

For the first and maybe the first couple of properties, I wouldn't worry about QB.

I would add a couple more pieces, making sure you have the capital to do the flips, knowing the scope of work that will need to be done on each flip, and finding people who can get you a good deal!

The sale of $1m is not nearly enough to interrupt the market, particularly over a couple of weeks.

I'll give you a couple of examples.

There are a couple of local meetups/events I know about but I'm still learning.

It  depends on the scale of your portfolio but if you have a couple properties and they’re all straightforward, I think google drive is fine. 

And BRRRR in general are hard to make pencil, primarily because rents in my market, while up, have not really grown as fast as overall property values, and the cost to finance is much higher relative to a couple years ago.

You have a couple ways to access that equity.... you can 1031 your orange county property into a large multifamily and create cashflow that way.

I'd get quotes from a couple lenders and just go with the best one or the one you'd want to build a relationship with.