if possible use  a conventional loan with low down payment options as  you will eventually be able to  eliminate the monthly  mtg insurance with  the conventional loan  and you cant do this with FHA loan …...if you plan to sell this first  property  in short run - then FHA  idea is OK amount to  save for rehab  will vary depending on the property the normal  down payment required for an owner occupied  3 or 4 plex  will  be larger  than for a  owner occupied  1 or 2 plex …...if buying and  financing property as  a rental  property ..the down payment  requirements are  higher

The specifics of adding additional units vary WILDLY across cities, towns, and counties.This strategy (buying and further developing with additional units) has been my specialty since 2011 - I've learned more about the complexities than I ever expected or wanted to, even with the loosened ordinances we have in place here now. 

I found a few on the internet including "Mysolo401K" "CompleteIRA" "New Direction IRA" "IRA Financial Group"  Set up fees and yearly fees vary.  

The exact percentage is going to vary from lender to lender (unless you go with a traditional mortgage and that is dictated by FNMA and other government agencies).Your plan sounds doable.  

Even those vary.  

Though real estate law varies from state to state, the owner would almost certainly have property access from a public road through an implied easement if not otherwise provided. 

Construction bachelor's degree, and 5 years of varying field experience?

I know this will vary by market, just looking for a rough idea.

The following categories of individuals and entities are excluded from the act and this chapter:(1) An owner of real estate with respect to property owned or leased by the owner.

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/If you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.