In your opinion, what is the most effective way to establish an LLC? 

@Jerry Cox Hey, I’ve done several transactions with Opendoor on both sides.

I would pay one of them to review the full details of the transaction and give you a road map of how to proceed before going any further.

Plus for its high cash flow potential, utilizing a 1031 exchange to reinvest gains effectively made this experiment a relatively low risk for me.

And this seems to be effective. 

A buyer's agent often knows the seller's agent from previous transactions and knows how they work and there usually would not be a question about this.2.

Not everyone has the same priorities - some care about interest rates the most, other care about the points the most, getting the most leverage, closing timeline, reputation, smoothness of the transaction, etc. 

Are there any  other effective  platform to list  the house for that purpose ? 

Now, you are asking can you use a Gap/Transactional funder for the downpayment and closing costs? 

It is a lot more cost effective to have things custom made than to pay 80% import tariff, plus it is local.