Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I'm looking to list my property with them but read some horror reviews online from guests (but not hosts). 

Hey @Tarcizio Goncalves, QuickBooks Online allows for everything you need. 

For building a buyers list, I’d recommend joining local real estate investment groups, both in person and online.

The successful wholesalers I know spend $8,000 + per month on online marketing, SEO, SEM, landing pages, lead conversion, etc.  

Check online reviews and test their responsiveness.

Saw this program on Facebook today.Like all online coaches, I question if someone is bringing in millions of dollars, why do they need to be hawking a $5k course?

Welcome to the BP online community.

@Joshua Tobin They all pay online through AppFolio.

we do a brief pre-application online before offering to physically show any apartments.