It’s usually best to open a separate business checking account so your rental income and expenses stay organized and away from personal funds.

The webpage has them based in Maryland but they aren't listed in the state's business directory.

Not to say that you'd pick crappy materials, but contractors with experience have manufacturers and suppliers that they know guarantee their products and that helps them know they can stand behind their work. 

.: Quote from @Chad Hale: I used QB when first starting my property management business.

No business succeeded by drilling many holes.

Try talking to local banks who want to do business with you.

This arrange that you will have will likely be a headache(major assumption on my part).First - Do not do business with a friend. 

I also believe that I should also invest is my business.

I am not sure what type of real estate investing you're considering, but it sounds like, with your family and busy job, you won't have a lot of time to be hands-on or personally involved. 

@Tonio PearceYes you should create a business plan.