House hacking plans advice please

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Okay i just started a new job 42k salary starting out hopefully land a analyst job 50k+ soon but for now i have 775 credit score i have 140k cash but only wanna use max 30k, i owe 0 student debt i own a business as well for 2nd income. my monthly expenses is $350 a month. I want to do the BRRR using the FHA loan/203k my questions are the following

1. where should i go to find under value MF homes to buy? its hard finding them here in north nj should i look for short sales or foreclosure?

2. base off experince how much cash would be good for down payment and closing cost?

3. where do i look for the properties? online the prices are retail and over inflated 

4. what are some good hot areas?

im looking to purchase a MF every year