Of course, if you do any renovations on the property to get it ready for rent, those renovations may need to be capitalized (added to your basis) or might be expensed, depending on what is done. 

It really depends on what you are looking for.

Insurance likely will be higher than $1,020/month nowadays but depends on your coverage and who you go with. 

The choice depends on your priorities, risk tolerance, and financial goals.

Depending on the size/value of your property, you may also want to consult a tax consultant regarding how to maximize your federal tax benefits and what can be expensed.

Also, depending on the part of town the home is in, it may be a great rental for military families or individual military renters.

I think your numbers on rents are solid, depending on where they are you could see 795, but conservative underwriting at 695 is right on track.

The amount of mark up could be 10%, it could be 20%, it could be a flat fee, or have a minimum: i.e. regardless of cost of repair, they will charge greater of $50 or 20%.Depending on the amount of steady maintenance your property needs, this can become very pricey.  

I'd say it really depends on the specific property and its condition.

Depending on your market, look at their ADU laws.