Your accountant will handle depreciation for you. 

I presently handle all the maintenance work working directly with the tenants.

I'll handle rehab cost, management and yearly expenses etc...and would like to build a nation wide company consisting of low income-luxury buy and holds, fix and flips, commercial, development and eventually branch out to vacation rentals as well.  

If you can handle it, you should be able to get five or more fourplexes by the time you are 30 and earning enough cash flow that you will have the financial resources to enjoy life.

For out-of-state ventures, a property manager may be required even if you intend to handle it yourself.

Partner #1 funds 100% guarantees loans and handles all the bookkeeping.   

A tenant complaining online might indicate that the property manager handled them appropriately, so be sure to ask the manager for their side of the story.7.

Study the problems landlords face, learn how to handle them, create policies and procedures, and get ahead of the game.

And when you really need a complicated setup like this is when you're under attack, meaning you need an attorney to handle the case.

Look in to a platform like Hemlane, Avail, or RenRedi to collect rent, screen tenants and handle maintenance.