I buy and hold and do short term rentals and mid term rentals.Located in Racine Wisconsin  Hello Gabriel: I also live in Racine County there are some great deals our way and including southern milwaukee county too!   

A diversified portfolio can include both!

How much do they charge and what's included?

One approach that I have not seen included in the discussion is as you are still in the planning phase, you could change your approach and the facts to make it more favorable for your strategy.

If not, I have included an article below that sheds light. 

If you are looking to just calculate profitability, set how much profit you want to make then:ARV - Purchase Costs - Holding Costs - Selling Costs - Desired Profit - Rehab Budget (including contingency) = Maximum Allowable OfferIF you cannot calculate those numbers, a spreadsheet isn't going to help you. 

Assume break even cash flow while rented which includes a generous $600/mo repair fund. 

However, if you sell instead of rebuilding, the IRS may include part of the payout in your taxable gain unless reinvested under the §1033 involuntary conversion rules, which allow you to defer taxes by purchasing a similar property within two years.If the property was your primary residence, you may exclude up to $250K (single) or $500K (married) of gains if you lived there for at least 2 of the last 5 years, likely resulting in no taxes owed.

Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

It should include the following First and last nameEmail addressPhone numbersocial media handlesNotesIn your notes section you will want to write in things like what the potential client is interested in, first and last time you corresponded with them and how you met them.