If moving into other real estate investments have to calculate how much they will potentially net you 

We created our own calculator to analyze deals.

Most investors don't do the refinance calculations at the time of the purchase and they find themselves stuck. 

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?

Get a thorough inspection to identify necessary repairs and calculate potential rental income versus costs.

What you can do is a cash out refinance and pay off the Heloc and take out some cash and consolidate (2) loans into one.If you were to calculate (3) loans more than likely your "blended rate" would be higher than a COR right now.

@Pratik KocharAs mentioned if you have gas and use it for heating and cooking and gas dryer, then 100 amp should be plentyIf you need to upgrade as mentioned go 200 amps but you can do a simple online calculation to determine what you need

-What's a good monthly passive income when calculating a deal?

. - Have you run the calculations for your monthly cashflow and rents for the area?

The sites mentioned above have calculators to estimate the potential income.