I am self-managing my ADU build in Oakland, CA and have come across a few snags. 

Given this I know I will need a property managner/property management firm at some point.

Hi starting a real estate investing company and looking for the best accounting software to manage financials from expenses; collecting rents; buying and selling, etc.

My advice is to form a relationship with a landlord attorney in your state, and in particular, one that is very familiar with property management, to prepare your lease specific to not only your state laws but also how you want to do business.

Anything I should keep in mind for managing a rental property out of state?

However, property management is not easy. 

I'm Steve Welty, the CEO of Good Life Property Management.

Instead I'd focus on building an application that allows people to easily search the database.

I use iGMS to manage my STRs and really like them. 

Make no mistake if self-employed and can only show low income it's because the applicant is low-income.