All reputable firms

when you hook up to city sewage , you have to pay a front foot assessment  ( covers the cost of the infrastructure )   then you have to pay a plumber to lay a pipe and connect , ( around $9000 ) then there is the hook up fee from the city ( around $ 20k in my area )    then you pay monthly sewer charges .i will take septic tanks all day long

Definitely quality answers from reputable people, but the one thing that wasn’t mentioned and I think is crucial with regard to aspect of time, is sourcing assets.

Example: Plumbers, painters, electricians.

Seriously listen to @Michaela G.Everything that I've been taught about credit history is spot on to what she's saying.If you go and pay off the amount it will become recent history and carry more weight than just leaving it alone.If you're going to do anything, speak with a reputable credit repair person.

Could anyone recommend reputable turn key investment companies? 

With none my own lenders, contractors, or reputation to draw from, for the first time, I had to ask for loans from family.

I know that many plumbers and electricians will try to pressure you to do everything all at once.

A knowledgeable, reputable mortgage banker is worth way more then the few bucks you might have saved going with the lowers rate.

Any recommendations on a reputable realtor in Miami who is familiar with condo associations that will allow short term rentals in a good investment area ?