What's the best way to find duplex for BRRRR?

[Henry Ko]

I'm looking into BRRRR strategy and looking into buying my first investment property. I appreciate any advice you might have. My budget is between 500k to 700k for a duplex in northern Jersey. Belleville, Kearny, Harrison, Jersey City etc.....
1- How do the I find the fixer upper properties? How much money do i need for 500k to 700k deal? 
2- How do you typically finance the fixer upper purchase? Only hard money lending options available or just depends on the property?