The less documents you sign and are legally responsible for the better. 

She will trust what she writes more than what you put down on paper.Once you have arrived do at the framework of a deal, list out a simple list of terms in about 6-8 line items then a list of documents that will be required and tasks or conditions that are to be met be each party. 

You spell out the terms of the financing in the contract, maybe referencing a standard FNMA mortgage document.  

To answer your questions, the first look site is easy to navigate but you must have all of your documents ready to upload at the time the offer is made.

If you continue with this option I encourage you to use an attorney experienced in creative financing and ensure that the proper documents are file with the Court in order to protect yourself and to "cloud" the title.  

You should be able to request a copy of the associations by-laws and documents to check what their rules are on this.

Mine is mid to high 600s even though I have perfect payment history because I max out many of my revolving accounts to buy real estate.Some banks will want to see that you are making money from the rental on your taxes and that it is leased for at least a year before they will even count rental income.  

You should have reviewed the condo's documents and financials prior to purchasing the unit.  

One of our local reps from Wells Fargo can even make the arrangements to send a banker to your place or work or residence to get the bank account documents signed. 

What if there is break in the chain of title further in history.