I know sellers who find a buyer with a track record and the seller does seller financing so there isn't a big capital gains issue (plus they're making money on interest). 

If it becomes and fix and flip I use Podio to manage my projects from beginning to end and allows me to record and track expenses even from the point of taking a photo of a receipt and categorizing it on the spot.

I might be off track but it seems like you might be looking at the numbers and not the deal.

We use a spreadsheet to track any deductions for issues caused by tenant damage.

I was already on track to retire at 49 (2022) and decided to buy a vacation rental in my town in 2020 for something to do, extra income and appreciation but also as overflow for friends and family to visit.  

Track income, build a reserve, calculate DTI, stabilize income through diversification, and start small.

Happy to make an intro to the CS Outsource answering service team that does our late-night support.They help with 24/7 emergency support, overnight coverage, troubleshooting issues, dispatching approved vendors & local staff, tracking and managing maintenance work orders, and other back-office tasks.

Lead generation/tracking? 

Having your own buyer's agent is important especially in situations like this because a "dual agent" can't help you negotiate this issue or offer guidance because they work for both sides.

We manage a portfolio of rentals across 6 states and are looking for the best way to track accounting, run investment return reports, replace quickbooks ourselves.