I've heard of Pace Mobey (which seems pretty self driven with modules which isn't what I want) and the creative finance playbook by Joe and Jen Dellefave (which I'm interested in, but lacks a quantity of reviews and also is over 10k to join.)

I'm not looking to pump out 100 offers a week, I am quality over quantity.

In practice, you sometimes should pay a bit more for the known quantity...a contractor that you can trust that you've used before, is honest, on-time, and has never let you down. 

There's no need to rush - quality > quantity. 

Just yesterday we closed on a deal at 80% ARV with nothing into the deal except closing costs for a known quantity borrower. 

I'm thinking of working with a partner and starting a few small flips on properties with smaller investment costs in states outside of California, but I'm struggling to come up with some of the solutions to some of the obvious questions like: - How to carefully monitor the quality and quantity of the contractor and sub-contractor's work without frequently visiting the site in-person multiple times a week?

And, as for mailers, I've also hired my kids to help batch mailers, especially in smaller quantities.

Remodeling is a more or less known quantity for us - new home building is not. 

Pushing you to think out of the box...if the market is tight and you have room to increase rent, may be the best way to scale is not in quantity, but in quality. 

Not a big believer than you can quantify risk.To really manage physical asset risk, you have to go for quality over quantity.