Having your RE license allows you to have access to the MLS and other benefits.

Always remember to do a math analysis on your selected possible property and try to look at it before you make an offer on the selected property or at least have a clause in the sales contract that will allow you some time (about 15 days) to inspect the property and possibly get out of the deal without much of a penalty that won't hurt you.Just select what is normal for that neighberhood and do not over-rehabilitate.  

The landlord accepted partial rent for a year and is going to have to explain to a judge or court why he allowed you to stay and made no attempt to evict.

Why do SEC regulations that "protect" the middle class also prevent them and allow only "accredited investors" (aka rich people) the ability to invest in private investment opportunities?

They may let you do all the work then refuse to allow you to use it as a commercial rental.

It sounds like you might be referring too one of the three available replacement property identification rules which allows you to identify any number of properties as long as the combined value of the identified properties does not exceed 200%. 

To the best of my knowledge (if I'm wrong here please correct me, someone), since the HUD manufactured home framework came out in the late 70s, multi unit manufactured homes have never been financeable with fannie/freddie/fha money, meaning no one ever made them, and probably no city ever allowed these types of modifications because they would create potential blights, meaning there's about a zero percent chance that any of the stuff making that thing a multi-unit has permits, is remotely close to being up to code, etc.

Do not try to do everything yourself.Always do the math analysis and try to look at the subject property before you make an offer or at least have a clause in the sales contract that allows you the time (usually about 15 days) to make a detailed inspection and possibly back out of the deal without a penalty that hurts   Right after you close on a deal get an insurance policy that will protect you in case of a loss.Just do what is average for the neighberhood.  

Talk to your IRA custodians to see if they allow checkbook IRA's.

My location only allows 3 non-related people in one house.