The other option would be diving deep with a bookkeeper to have them help run more updated books than just monthly.

Spend time reading through posts in the forum.Get and read Avery Carl's book.

That will typically spook them into catching up or chase them out.I recommend you read some books (see my signature?)

I'm fine with the money down and shorter term but the higher rates and the ARM I am not a fan of in general.  

Quote from @Mike Hern: Quote from @Michael Plaks:While it isn't directly related, does the Cohan Rule apply to real estate professionals without a W2, who lost their mileage book during the year?

(I remember when my dad bought some books from Amazon.com in 1996 or 1997; he wasn’t a pioneer, but he was a fairly early adopter, and immediately recognized the consumer value that Amazon brought.) 

That being said, I'm a big fan of Zillow Housing Data.

Would read 3 to 4 books a day.

I’d also love any recommendations for beginner-friendly books, podcasts, or other resources that are suitable for a teenager. 

I wouldn't worry too much about it, if you have a competent CPA or bookkeeper they should be able to review your books and within minutes have a strong grasp on who gets a 1099 (spoiler alert, not every contractor gets one, I'll be annoyed if I get one since I'm structured as an S corporation) and the amounts to report.1099 filings are usually a loss leader for us, so if you're working with a professional make sure you take advantage of them filing everything for you.