I don't know really know how to make the first step and would like advice from someone who has the on hand experience.

You can threaten legal action, but your probably only going to get reimbursed for your expenses and then comes the challenge of collecting on it.

I don't know how large your condo complex is, but for condos of 50 or more units, it would be a challenge to get every owner to get to it, and properly clean the vents if it was discovered  vents were never cleaned and it could be a safety hazard.I also had special assessments for new roofs, other building wide improvements at my rental condos. 

My first step that I want to take is by getting a job in the real estate field to help learn the business.

Because of this, my sister took charge and got a PM to step in.

Then my mortgage company had a list of things I had to submit, including inspections they performed, before sending back the money.I would think anyone with flood insurance would have to go through the same process of working with the mortgage holder to get access to the insurance funds.Now if the government steps in and offers money to affected homeowners, no telling what rules will or will not be in place around those funds.

If you find a property with potential but is vacant, what's the next step?

We've stepped up rent gradually in those cases.  

Next step is to open up the account to hold the funds.So my next question is Brokerage account or Bank Account?

My last piece of general advice would be to take each step of the process of purchasing a property and break it down into sections.