While looking I found a couple houses that I liked for $80,000 that we could afford and generate positive cash flow in the future and quite a few fix up houses for $45,000-$65,000.

Inform your lender that the title company will take care of everything and that they may call her.They can generate the note and deed of trust common for your area, they have an attorney in house or on retainer and they will tell you what the charge will be, probably $100 or so for the note.Your lender needs to provide certified funds to the closing company ahead of settlement, they can tell you when they need good funds.Sit back, wait, go to closing, the title company will take care of documents, disclosures required and filings.I also suggest a loan servicing company, search the benefits here on BP for my posts concerning "Loan Servicing".

I am not sure nor am this is a legal advise.

Please, I nedd advise for this problem. 

Joel and all, which areas/states would you advise and do you have any recommendation for companies that could help me invest in the US as a foreign national ? 

Investing implies the use of YOUR money, to generate more money.  

I wouldn't think a property that is rented and generating income is a candidate for a wholesaler.

Please advise and thank you. 

If I'm lucky, because it is cash, I can get the property lower than asking price and when refinancing, hopefully can take out more cash.I don't know, please advise BP

What does your realtor advise?