It's normal for people to want to know details. My dad knew we were getting engaged because FH had shown him the ring, etc but he didn't know when. I called him right away because FH told me how excited my dad was. First question my dad asked was "when's the date?" We had only been engaged for about 20 minutes & I was still in shock!
congratulations. my FH and i picked our date a week after we got engaged, but the date we picked was a year and seven months away. right away, people were asking very specific details, we just kept saying, "i don't know, it's a year and a half away!" i don't know why people think the whole wedding is planned the minute you say "yes".