Learn your own backyard, maximize that opportunity, and then expand to other markets. 

If your husband filed the taxes and the entire $24,000 is being depreciated instead of partially expensed, it is not technically "wrong", but it certainly isn't maximized.Also remember, that for some people, it is NOT beneficial for them to be maximizing deductions and it may be better to have more long term depreciation than to expense up front.

Because the reason you're hiring them is to maximize YOUR bottom line while still operating within the code and doing fair dealing with all parties. 

I already have started building my credit, I have 2 credit cards and have been paying it in full, on time, and staying below the 30% credit utilization to maximize my credit score. 

Your goal should be to maximize your ROI, not lower the down payment.

Most people on BP are big fans of self managing so we can maximize profits.

So step 1 is maximize the profit that you get to keep.  

There are some process differences from one Housing Authority to the next (for example- how to get approved as a Section 8 landlord, in what order new tenant processes happen, and on what timeline rent increases are allowed will vary) but we discuss those and how to determine/maximize in your local market/Housing Authority.

You need to understand how to invest your capital in a way that is maximizing returns and minimizing risks.

They can guide you through the legal process, represent your interests, and help maximize your chances of recovering unpaid rent or damages.