There are some great replies in here already but I would also want to suggest the use of virtual management software as a supplement to traditional management as well.There are some powerful software tools out there that essential manage all of those units from your computer screen (collect rent, process maintenance tickets).Hire a local handyman and they can act as your boots on the ground in case of notices or emergencies.This may help you save a couple hundred bucks down the road from the rising prices that management companies are charging now. 

Example would be emails (not using a personal email) bank accounts, LLC's, accounting software etc..Do you lump everything into one account, one email and one accounting system under one LLC or do you break up each into their own individual business? 

I was wondering if there was any software that provides a solution to this?

Yes I am using a screen reading software that allows me to use a computer.

Another investor just sent me an email about software called Flipster.  

I am 37 years old software engineer and want to build some rental properties for rainy days.

Hey all, I am reviewing property management software.  

I don't have access to 3D (or even 2D) layout software to help with this.  

Does anyone use software for this?

@Kevin Lefeuvre actually, yes, I did find a way but I took the hard way around and developed some software to link Airbnb with VRBO/Homeaway in a central calendar system.