Welcome Scott,There's a ton of useful resources here on Bigger Pockets from calculators designed to show profit/loss to seasoned investors giving advice.

Per this NY Times article, the average American knows around 600 people.https://www.nytimes.com/2013/02/19/science/the-average-american-knows-how-many-people.html#:~:text=The%20average%20American%20knows%20about,do%20you%20know%20named%20Kevin%3FPer the US Census Bureau, the average American moves 11.7 time in their life, which based upon an approximate lifespan of 84 years, works out to be about every 7 years.https://www.census.gov/topics/population/migration/guidance/calculating-migration-expectancy.html#:~:text=Using%202007%20ACS%20data%2C%20it,one%20move%20per%20single%20yearSo, if the average American knows 600 people and they each move about every 7 years, that means that the average American knows around 85 people that move in any given year.How many of those moves do you want to be involved in?

You can't calculate it like that because you are going to make about 20 percent of mistakes buying on your first 5-8 properties.

If they can agree on current value then equity calculation is easy.  

To determine rehab costs, calculate the After Repair Value (ARV), total rehab costs, purchase price, and other expenses.

Upfront expenses and monthly payments must be considered when calculating the return on your investment.EXAMPLEYou cash out $100,000 of your equity and use this as a down payment on a $400,000 investment property.

Hi,I’ve analyzed thousands of deals using the BP STR calculator through AirDNA.

@christopher brown I am not the best at the depreciation calculations. 

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

If I make a lump sum payment of $10,000 towards the principal, the future monthly payments of $5000 should go a lot more towards the principal since there is less total balance to calculate the interest.