DS 260 HELP!!

[P & A 0]

HI EVERYONE, I'M TRYING TO FILE DS 260 for K1 AND HAVE SOME QUESTIONS ABOUT IT.

1. It asks about the petitioner, I've read most people have chosen SPOUSE because there is no FIANCEE option, is it true?

2. I took a course out of state for less than 2 months, I didnt list these adress in the G25 because I was traveling everyweek and staying only for 3 days in that city, should I do the same in DS 260?

3. I have a B1/B2 BCC that expired 2 months ago, I cant find the visa number (I thought I did at the back of the visa, but the number doesnt fit), should I chose I DONT KNOW??

4. Have you attended any educational institutions at a secondary level or above?, After my bachelor (I graduated a year and a half ago), I have done some small courses related to it (Im a product designer, the classes have been 2-3 months long about fashion, bussiness managment, industrial sawing, etc should I write any of these??, Im currently unemployed, only taking those classes, so should i list them or not??

5. Do you have documentation to establish that you have received vaccinations in accordance with U.S. law? I have the proper mexican documentation (cartilla de vacunación), is that a yes o a no?

Thanks a lot!!!