On #2, i have been researching today what people typically charge. 

@Troy Ramey made some excellent points, I would also add that you should look into the 3% down payment conventional loan options, as they are typically much better loans for people with decent credit than FHA loans are.

Such as road construction, city pipelines etc. 

My repairs/capex are typically half of what you have because of the extent of the rehab.

It seems to be one of the most opinionated statement in investing.Unfortunately, I have been bedridden for a few years and I have spent much of my time learning and I was in construction management and real estate licensure for about 30 years beforehand. 

A conventional mortgage will typically need 20% down.

Basically, the typical," you don't know what you don't know", situation.

Be Careful on a fix and flips, you can get in trouble, even if you have some construction experience.  

You should also consider a commercial construction loan.

I am going to get a regular FHA construction loan, but the house I want to design and build will be a rooming house, possibly 9-14 bedrooms and 4-5 bathrooms.