After the offer is accepted, submit the Purchase Agreement (drawn up by or at least reviewed by an attorney). 

sorry if this is so simple for you guys but this is confusing, and I already read as much as possible about how to negotiate pre-foreclosures, or how to negotiate a purchase agreement and as you can see I am still confused, so i decide to create an account to see if you guys can share your knowledge with me. thank you very much in advance I really want to learn this.  

I would use an independant contractor agreement with your contractor friend and do a few deals before I formed a formal entity with him. 

We'll need an operating agreement and other agreements to tie it all together. 

I have 4 individuals (2 couples) listed on a lease agreement that runs for 3 more months.

I searched in Property Appraisers, property shark, and any source of information where i can find the owners current address or any type of contact info but all i get is that address where the house is vacant but obviously no one lives there, kinda strange but i would like to hear from experts on how you find property owners because im new to this and been trying to get my first deal under agreement to wholesale.

Any animals on the property not registered under this Rental Agreement will be presumed to be strays and will be disposed of according to law, at the option of the Landlord.Any Pets approved by the Landlord are subject to a non-refundable fee of $275/pet at the time the Pet arrives and $25/pet/month thereafter.

The agreement was that I would buy the house they want (down payment) and they would pay me $300 over the mortgage.  

You will absolutely need a partnership agreement as well.  

I don't have any language that covers this situation in the lease--because the agreement is--she's responsible.