Replaced fill valve and supply line" and the charge came to 243.50 (this seems reasonable for call and the fix). 

There are hard-money lenders but they charge higher interest and are typically only recommended for short-term funding, like a quick flip.Perhaps you can find a commercial lender that would fund purchasing the entire portfolio under a commercial loan?

But if you need to charge $2,500/mo for your new units, then you will likely struggle to hit market occupancy, since you need incomes of about $90k to support these rents.

All of which would charge a per inspection fee.

Mortgage is about $2,100 and I charge rent of $1,950.

My question is how do I whole sale the deals an how much should I charge?

It may sound nice to pay a 5% management fee but the extra fees can add up to be more than the other company that charges 10% with no add-on fees.

Especially if nothing was maintained along the way, which I doubt it was if the owner was charging her $450 a month. 

I'm happy to give some guidance, no charge, and would love to know more about any markets in Florida that aren't already saturated with wholesalers.

How much do i charge for my time if they now want to go see it and trusting me to go with them?