Could you let me know which resources or websites you've been utilizing to discover these types of deals online?

You can do this online by looking at their catalog. 

All of this should be public information and posted online.

My question is, for the unit I am moving out of, what’s the best company to use for online applications, tenant screening, background checks, credit pull, etc. ?

Can I just lookup one online?

(Call and say you want to attend the FFP event; its cheaper than signing up online. 

A lot of online "applications" through popular sites like Zillow or others will either redact this or will delete the application.... not idea.

I was left with (and still use) Quickbooks Online.

Setting up automatic payments for recurring expenses or using online bill pay services can help ensure that bills are paid on time and reduce the risk of missing payments.Overall, the key is to establish a consistent process for tracking and managing expenses for each property/entity to effectively manage your funds and ensure that expenses are properly allocated.

Renovated all apartments, converted M2M tenants to annual leases, instituted strict rental criteria, implemented online payment portal, invested $75,000 into leasehold improvements (HVAC, drainage, exterior paint, concrete.)