Quote from @Jimmy Wellman: I've looked online for some information about the average % of the final home price vs. the price you purchase the home for and found that the home should be purchased for 70% of your home's final sale price. 

In a dream world - the comprehensive solution does all this: *task management and sequencing where you can drop a property into a sequence ie day 1 call, day 2 mailer (have it automatically mail out something like a postcard) day 3 etc etc etc*project management outside of the outreach sequences for what's next in the process ie schedule inspection, send the contract, etc etc*ability to have multiple users drive around and if you see a property you can tag an address and add it into a marketing sequence, and also track the streets you've hit so you're not wasting time driving by the same houses more than once *dialer (ability to parallel dial numerous numbers simultaneously to make cold calling more efficient - Ive used tools like orum and kixie in other industries, and when you receive a pickup, the other calls are dropped) *skip tracing/data provider *website landing page for converting online visitors to leads*electronic signature/docusign*secondary branded landing site on different URL for blasts for deal disposition to your buyer listWhat am I missing? 

You can also buy a Landlord Forms package from Biggerpockets, me, or find one online and hope it's sufficient and legal.You don't need an app to manage your property.

Are you focusing on online lead gen like Facebook ads, Zillow, or platforms like BiggerPockets?

You can also check their reviews online at Google, Facebook, or Yelp.

I encourage you to take a look at out pages, reviews and feedback from other owners posted online.

Finding a random one online is going to be more hassle than it is worth.

There is a lot of helpful information online, especially on BP, but nothing beats connecting with people in your market. 

Explore out-of-state markets like the Midwest and Southeast, use local property managers, and join online investor groups.

Join online communities like Facebook Groups and BiggerPockets Forums to engage with experienced investors.