It's really tough to scale to any meaningful level - especially if your goal is to someday live off your rental income. 

The challenge is that I know we have this equity in this home yet I need to extract it so that we can buy first, then sell existing.

You want to focus on one area so that you're familiar with the area and so that you have meaningful relationships with brokers, property managers, and other professionals that will ultimately lead to you getting better deals and better information.2.

When searching probate lists online, which records should I be looking to extract, letter of testamentary, or any other specific type of records?

Indy is a very diverse city and it can vary block to block so focusing on townships isn't going to be very meaningful.

Just so I understand, in a market where ARV's can be much much higher than purchase prices, it is not always ideal to extract the full 70% of ARV.

Most hotels will simply never be conducive to being a multifamily and most larger cities will extract a pound of flesh in the process.

The idea behind BRRRR is to extract all of your investment to be able to reuse it. 

The systems are the key to efficiency and meaningful growth for realtors AND investing.They help guide with data and automate a good amount of you and your offices to Dosplenary out there to review and choose to suit you and your businesses

This is less an issue if house hacking (95% LTV), doing a value add with a refi (extract out of investment), or using creative financing (obtaining higher than 80% LTV).