And there was a black guy sitting in the chair to the right of the door looking at paper work. 

(And even after you read up on DOS clauses, take your actual mortgage loan paperwork (or contact info) to him/her to find out how the Due on Sale clause may/may not relate to your situation). 

They never filed paperwork to retrieve any money, we actually did.  

Essentially the most flexible 203k loan I've ever heard of.

All of those reports will need to be ordered by the lender, so as not to create a conflict of interest.In terms of the contracts, unlike for the single family residential there is no set contract, however, there is significant paperwork requirement and various HUD applicable forms that need to be executed.The biggest pitfall is that an FHA transaction takes longer to close than a Portfolio, Fannie Mae or a Freddie deals, since due diligence is much more extensive in regards to you and the property.

Is there any additional paperwork regarding that?

Managing contractors and time lines is essential.

How much should I pay a realtor to do the paperwork only on a sale.  

The marketing, photos, closing paperwork etc must be handled by someone else. 

If anyone can share the process, I would like to learn more about what paperwork has to be filed, what costs they incur.