Are there any year ranges of properties that you would avoid for difficulty of updating and rehabbing, i.e. years where lead paint were issues, years where certain building materials where outlawed etc? 

I would agree that general networking and education help lead you to a market,  but it gets overwhelming in where you turn to collect data from there. 

I started finding leads, did a some direct mailing, got one call back, but the next step is my obstacle, how to make offer, finding cash buyers and so forth. 

Also assistance with lead generation, closing and etc would be very much appreciated.

Foremost is the leading market for mobile homes but I do have a couple other options that may be more competitive.

Selling everything would lead to Uncle Sam adding over 100k to my annual income and therefore tax me quite a bit for it.. give me some ideas!

If they don’t, most of your houses will sit empty, leading to significant income loss.

What software or company would you recommend for lead generation? 

By the way, Apartments.com is not the only place you can use for your rental leads.

I've also been leading the charge on the Operating Agreement for our eventual LLC.