First I think it is AWESOME that your family shares the same interest in hobbies. Maybe someday my little girl will play in a fantasy football league with me haha.
I too am zero help when it comes to D&D. I was overwhelmed from merely reading the great comment @mrlightning left lol.
When I was in the military there were a handful of guys that would play D&D on the weekends and I remember their games lasting 12+ hours it seemed. I should have taken that opportunity to ask to play even though it isn't quite up my alley. There is a good chance I will never have the opportunity to play again unless my cousins in Georgia play. They were heavy into Magic the Gathering when we were young and they introduced me to Star Wars among many other things that I wasn't exposed to as a kid focused on athletics.
I had dreamed of my son playing Madden Football with me some day... well that ain't happening. But I have this stuff lol.
I bet you can get your daughter involved. Kids are naturally drawn to what their parents are doing. They will use any excuse to sit and cuddle with their mom and dad. Football is just as good an excuse as any... as long as you don't yell at the tv as much as I do. My daughter will come running to calm me down when i really snap.