Need some advice on investing in Muti family home in north nj

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Hey everyone im looking for multi family properties that comes with good cash flow. I know its very hard to find deals in NJ since the taxes are high and everything else but i would like to know from PEOPLE WHO ACTUALLY ARE INVESTORS to tell me the following

1. how much they put down cash wise 

2. how long do you wait before you refi 

3. whats the typical cash flow you had example 1k net profit per month etc so i can have an idea

4. what are some good areas where new projects are being built

5. what are some of the worst areas to stay away from

6. what are some of the challenges you face

7. hows your experience with property management companies

if anyone can help god bless you. I am looking to buy my 1st property live in one unit rent the rest rehab refi than do it again 

also i am open to creating a investment group of some investors to pull their funds together for bigger apartment buildings to be built or bought.