I now desire to purchase an investment property to make a rental for additional income.

I've also been looking at a couple condos in my desired area and I couldn't figure out why they weren't selling.

I do agree that if someone wants to colleague with you or follow you, there must be a stated reason or desire.  

Honestly other than asking others who do use property management companies in your area I see little you can do to keep from being exposed to Property Management companies that will over bill you or otherwise take more than is absolutely necessary for them to perform the function you desire from them. 

What is your desired result?

So as i diversify into real estate I'd rather own properties that have a greater chance of appreciation over time with lower cap rates versus high cash flowing properties that are in less desirable neigjborhoods or cities  that owner occupants are leaving.  

That said, bringing in private Monday like Josh said as equity satisfies that OPM desire.

I only have one rental unit right now and it's been very successful for me, but it's in a desirable area where I'm able to be selective with tenants.

You should be frustrated with the person that told you that all you need was a desire and to email a realtor and the opportunities would flow in.  

If you want to tackle it yourself there is lots of information in the BP Free How To Guides.Regarding the down payment, typically investors put as little money down as necessary to still provide the cash flow desired from the property.