For example, you clean the unit and I will waive the fee.

@Tom Cooper, I am new to investing and hear everywhere that to get a good deal would be 70% of the ARV - Repairs - my fee to wholesale, I go to several meetings and the investors I meet don't want 80-85% they want 70% (Not sure if they are just as new to the business as I am).

If Bob is the seller to the end buy and just assigning his agreement, the buyer from Bob will likely not be able to finance the Wholesale fee.

In this case, is it legal for me to act in the capacity of a finder and charge a finder's fee considering he negotiates the deal himself?  

You are paying them a monthly fee & insurance so they are more opt to consider you pay them to hang your license while learning the ropes.  

I was the only bidder & I purchased it for $211,331 using a HML with 25% down, 12% rate, 11mo term, with a $225 transaction fee and a $200 payoff fee payable at the end.

Even if they have a full time job they may be willing/interested in going the extra mile if you offer a fee for each mobile home they find/fix/get ready/rent, etc.  

What do they charge to be a student?

Also, does anyone have a recommendation for the best wiget for accepting fees and rental payments?

But not everyone will be nice and there will come a time when you will have to be assertive and firm and will have to ask them to leave, and that is with applicants who wonder why you charge so much for rent and move in fees.