In order to do so, I'd like to minimize my downpayment on the duplex I'm about to purchase.

I have no money of my own and in the process of refinancing my personal home.  

I had one of the tenants, sign a 7 day notice on the off chance they would pay.Today is the last day to pay and I haven't heard from them, except for a text message from a relative of theirs saying that I needed to let them pay late or they would drag out the eviction process.

Depending on the entitlement process and design, it could take you as few as 12 months to 24 months to even begin to put a shovel to the ground.  1.

I'm a local investor and I'm always happy to meet new fellow investor and if so, help them in their process.

If they are an experienced investor who is also coaching and mentoring you through the process and not just providing capital than I would say a 30/70 split isn't crazy either. 

My wife and I are in the process of purchasing a multifamily (2-flat) property on the north side of Chicago (with intent to owner occupied/house-hack) .

They take a fee for finding the banks and processing the loans.

Starting a business in the U.S. as a Foreign National can be challenging but I can walk you through the process.

My husband and I are working towards financial freedom, and on a personal level I have really embraced minimalism (in terms of not buying 'stuff' and not spending money on experiences that don't enhance my life).