Just watching YouTube videos gives you only part of the solution. 

Reach out if you have any questions on these products as they are one of my areas of expertise.

I'm about to buy to 4/3 home that's 2,300 sq ft, built in 1967 and want an experienced real estate investor to evaluate whether it's a good deal.Please comment below if I can pay you for 1 hour of your time to analyze it.I have full photos/video walkthrough, and also have several contractor quotes.

I think marketing is the key before you even get started with a home at least thats what I'm seeing from various comments and also Youtube videos.

What I mean is that on most products on a investment property 2 unit building the max loan to value is going to be 70% or maybe 75% loan to value.

@Seth Mattox know someone doing it in Cleveland.Their biggest challenge is finding reliable boots on the ground to keep an eye on everything.Take videos instead of pics.

Production depends on the owner and the home. 

Moreover, you'll receive more favorable terms/rates utilizing a primarily home loan product than an investment loan. 

They insert a sock and I believe use an epoxy product to create a liner inside the old cast iron pipe significantly extending its life for much less cost.

Know the lenders requirements for the loan types you will need.For instance you may find you need to have liquid cash of 9 Months P&I and 100% of the loan amount as your personal net worth in order to avoid personal guarantees on the loan, and your retirement accounts may not count towards your liquidity.Know the requirements of the loan products for the apartments you want to buy.There are no books for that, that I know of--just lenders info.Because without that all else is just scholastic exercise.Good Luck!