I am a 39 year old software engineer, looking to get into rentals and whatnot.  

@Jared P.Quickbooks is an accounting/bookkeeping software that is used to track your data(income/expenses/assets/etc).If the property types are organized in a separate entity type, I would have them in two separate files.If they are not in a different entity type, you may want to use the "class" function within quickbooks to distinguish the asset classes.With that said, you may want to still operate them in two separate files if you find it that both businesses are too unique to another.

There is "what if" software made available to mortgage people like myself.

- Get deal analyzer software?

In Memphis, there are publications that publish online public information that we utilize in addition to what our PM software offers that are more real time, especially with eviction filings.

You can also buy lists from companies like list source and there are some REI software companies that have a cash buyer search feature.Some of best ways to find motivated sellers is to purchase lists from companies like listsource and or compile lists from city and county like 60-90-120 days late on mortgage, pre-foreclosure, delinquent taxes, water cutoff, code violation, probate, divorce, etc.

Prefer integration with airbnb automation software as well. 

The blog has numerous tutorials, and you can copy the examples from the blog posts into your own account to play with them.The software was developed by a friend of mine that also happens to be a Realtor that focuses almost exclusively on working with investors.

The alternative is to hire a full time onsite manager capable of performing all the duties of management, home sales, managing maintenance and repairs, and the implementation of software systems and processes that will eventually have the park running like a Swiss watch.

Is there any free software you guys use to manage prospective tenants visits, appointments which can sync to my outlook or gmail calendar please?