Welcome to the world of teens....
I helped my daughter keep a calendar so she could predict when she was about to start. This also came in handy with the pedi when she asked about her period. My dd is very predictable and I can always tell by her mood the week before:)
I had a hysterectomy back in 2001 and I had not even purchased supplies for her. I was enjoying no cycle too much!!
I think my daughter started around 11. She might have worn pads 1 time, after that tampons all the way. She will use a pad at night.
If your dd wants to use tampons, let her. There is no harm in using tampons, just make sure she knows when to change them, etc.
My mom was/is so prudish and frigid....she did not want me using tampons. However, I got them on my own an she had no idea I was using them. Please don't make your daughter feel embarrassed or dirty because of her period. You sound like a good mother who communicates. COMMUNICATION is KEY, especially now.
Congratulations on this milestone.