@Nate R.

I am going to list them:TurboTenantIt is completely free to advertise your rental, screen your tenants.You upload your pictures, write a description and it posts to 20+ websites for freeTakes about 24-48 hours for leads to come in.Once you select a tenant, they pay for the background check, upload documents (paystubs, ID, W2) and it is all set to you.It even helps you build a lease after you select a tenant (there is a $30+ fee for the lease)My referral code (https://turbotenant.com/r/T3duZXI6MTc5ODEy)Full disclosure. 

How do you screen tenants (methods like Income verification, Credit Checks Approval/Pre-Approval)?

A good strategy would be to find a property that is zoned R-2 and over 500 feet away from another STR.

It sparked me to continue to grow my portfolio and even consider looking into the BRRR method moving forward.

Specifically using the BRRRR Method.

However, there are a few investors here on BP that are methodically buying and growing their portfolios much bigger and I'm sure they would share their strategy. 

All of my tenants have been paying in cash but I want to switch them to electronic/automatic payment methods.

@Alexis R Beckley congratulations on getting your license.  

Use aggressive methods to depreciate everything.