For your scenario, a DSCR loan could work well if the property’s projected rental income can cover debt payments, but most DSCR lenders don't include renovation costs directly.

Additionally, the estimate for my tax preparation for this year was approximately $1,000 over the cost I paid last year (including the time I paid for them to correct their errors).

DOM can be minimized by a number of different factors including the quality of marketing, rent price, availability to show. 

Would you share 3 specific things I should do during my "training period" (if it includes a book, which one)?

Screening: Includes income verification and rental history verification.

We don't allow any "deal-making" in the forums, which includes advertising your services or properties, looking for partners, etc.

We offer a ton of different fix-and-flip programs including putting 10% down on the purchase price and funding 100% of the rehab.

This includes credit, criminal, and rental history checks for all parties.

I have only 3 doors that I manage so not a big time player so wanted to start with some cheaper software and I heard on the podcasts that RentRedi was included in my pro membership so I signed up.  

You should be able to do a pretty decent update with $50k (purchase price not included).