A manager will roughly cost $100-$150 a month to take over a unit (it could be more or less in your market) and manage the units.

We are extremely unhappy with our property management company.

Samford's business school also offers a concentration in real estate investment and management.

@Dwight HenningRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

Can you recommend a management software for managing 100+ doors I tried Cozy.

That's for all "standard" Property Management "things". 

@Gutta Bunni are you advertising your management services?

One of the most important steps you can take as either a startup landlord or seasoned one is to use a platform specific to property management as it will elevate your operation and save you tons of time.The good news is that nearly every software designed for landlords includes these features.

I personally do not have experience managing rentals.

We have a property management company and real estate brokerage.