Most sponsors who have actually survived multiple real-estate cycles, say that simple staying power through inevitable downturns is the most important key to long-term success.

If you're investing out-of-state, you're really going to want the buying power and reserve cushion that 100K gives you.

When I first got started, I was overwhelmed by all the options and opinions, but I realized I was getting in my own way.

One tool I already have is PropStream, which I know can be incredibly powerful.

If arrears feel overwhelming, selling is the safer option to avoid foreclosure.

If you desire to get it by all means go for it - knowledge is power - but thats knowledge you pay for that may or may not pay off for you.  

If you co-sign, the loan will consider both your incomes but also both credit scores, so her credit could impact the terms or buying power.

house hacking is a powerful way to get started.

Deeds of Trust contain a "Power of Sale" which allows the Mortgagee to enforce a foreclosure without a judicial process.

Most of the negative feedback on BBB has to do with their lack of responsiveness, which could be a growing pain issue since they are affiliated with at least several large REI groups that I am aware of, so are presumably overwhelmed with new business right now.