A few questions while K1 is pending

[felipeTAYA 18]

Hi, I will soon submit the I-129F petition for Alien fiance. I just had a few questions.

1. I know that evidence needs to be sent to show that we met in the last two years. I want to include extra evidence to show this relationship is legit and not for fraud. So, I was wondering if it would be OK to send documents related to reserving a wedding hall for wedding ceremony (our wedding is in May 2017). The reason why I ask is because our wedding ceremony is in Korea, but the actual marriage will be filed in the United States. So even though we have a ceremony, we won't be actually married legally until she comes over using the K1 visa. I'm hoping the wedding abroad, but marriage in U.S. doesn't throw off the case manager.

2. While the K1 is pending, will she be required to do any paper work? If so, can it be done while she is visiting in the United States? We had an alternative plan for her to immigrate here, but decided to switch to the K1. Part of the old plan was her visiting the US in March, and then I would return with her to Korea in May for the wedding ceremony. My worry is that with the average time of 5 months processing (California service center), she is suddenly called for an interview before mid May, and she is still over here visiting, or she has to do paperwork that is required of her to stay in Korea. Does the medical exam for my fiance need to be done in Korea since she lives over there?

3. Is it only the beneficiary that is at the interview?

4. When should I file DS-160 (or is it beneficiary that files it?) and I-134?

Thank you.