It just depends on your goals and how much you have to work with.  

What you will pay in interest on the "rehab" fund depends upon your network of private lenders. 

Typically, it will require 30-50% down (depending on the lender you use, property type, state and few other factors).

You're completely dependent on the quality of your property management company and when they do a poor job screening, you end up with a destroyed property and expensive evictions.

But you can only use non-recourse financing, which typically requires larger down-payment, depending on the balance of your 401k and the purchase price, this may or may not work for you.

Depends on what you want and what kind of connections you have.

To reiterate, a lot depends on the overall returns.

You can for sure find houses within your price range that will produce rents from $700-$1300(I know that's a wide range) depending on the house and area.The Kansas Side has some appealing areas that will produce similar results.

It all depends on the price point and condition of the flip.

Depending on your area as well.