Compared to many threads on this forum, yours is relatively uncontaminated by off-topic posts!
I'm not clear what your unanswered questions are, but to address the big-picture matter:
My interpretation is that the agency is about cash extraction, not helping people to find their true love.
It's possible that your correspondent is sincere, but unfortunately it often happens that women who participate with these agencies are part of the money-making scheme: they get a percentage of the takings. Such women may have a local boyfriend, or even be married.
Whether to proceed is a judgment call. I have avoided agencies myself, but several men on this forum have recommended establishing a communication channel with the woman that is completely independent of the agency -- the sooner, the better. Get her phone number or email. You can communicate by Skype without spending a penny.
I'm from the U.S.& I found the girl of my dreams. She lives in Mykolaiv, Ukraine. How or which way is the best way to bring her home? There are many good Ideas: married there, married there. K1 visa,K3 visa. U.S. consulate? HELP if you can
If you are a foreigner marrying in Ukraine, you have to prove its a real marriage and wait up to 30 days to get approval, depending on city/Oblast.
Fiance visas are probably better for most people but you still have to prove ongoing relationship/fiance status.