BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.

Analyze and submit offer based on if you would have a 3rd party property manager.

When BRRRR was really popularized rates were very low so the holding costs were much better.There are a lot of local real estate investing meetups that you guys can attend.

To start your first BRRRR investment, define your investment criteria, focus on submarkets with favorable cash flow and rehab costs, build your team, analyze deals using tools like BiggerPockets BRRRR calculator, and start small.

How is the STR market there, is it a popular area? 

When analyzing a new build/“build to rent” property as a rental, what percentages/amounts are others using for:-Maintenance/Repairs-Vacancy-CapexI’d assume it’s less than than existing homes, but by half or is it safer to use the standard percentages?

You are in the right place if you are looking to learn, network, or begin taking deliberate action (like finding and analyzing deals) in your real estate portfolio. 

You will need to analyze the developments and decide what you think will be best.) - What markets are good markets for investing/buying large multifamiliy apartment complexes?

Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

You'd analyze it as a "cash purchase" and add a special expense category for your principal & interest payment.