Some specialize in quick fix and flips. 

We thought that rents could be raised as well, but also thought the asking price was decentIt our situation, we paid full asking price, but also asked for $20,000 at closing to fix various issues and have some in reserve in case things went bad quicker than we thought. 

I got a stop work order once cause I fix a portion of a fence that was falling down, fought the stop work order, but what a pain in the you know what.

The other is once he has the job locked down, he doesn't really have an incentive to fix it fast since there is no real reward at the end of it while you have to cover the carrying costs. 

I’m new in South Florida and I would like start my own fix/flip business.

My first choice is to always go with a fixed rate of return...so say  10% on their money. 

Are you looking to fix and flip or fix and rent? 

I even did the labor to fix their broken stuff for free.

It is not a quick fix but if the seller really needs more time, then perhaps you can agree to a three (3) month lease.

Thanks @Sen AndoMy numbers about mortgage, insurance at stuff are correct and those are the actual numbers.The question is if to go more on appreciation like you said or just wait for a better deal cash flow that might be appreciated as well.My agent says that if I buy for 250K now and next summer for around 20-30 in fixing up things I can sell it then for around 350K but of course it's all estimated.