L.M.
I've been a GS mom for 10 years. My colleague is a GS trainer on the daisy level. One of the first steps in being a leader is being trained by someone in your council. They will let you know all the of ins and outs of setting up a troop, forms that need to be completed, safety regulations, etc.
As far as running the individual troop, a lot is your personal decission. You'll definitely need as assistance or co-leader and depending on the size of the troop, you my require additional adult assistance. You can decide when to meet and for how long. Depending on the time you meet, there's usually some type of snack that is provided which can be provided by a different member each meeting, or purchased from the troop funds. My girls were not in daisies, but started in Kindergarden at a Brownie level (it's changed). My girls have been in troops where the leaders wanted heavy parent support and in other troops where the parents basically just dropped off and picked up. You can decide what works best for your troop dynamics.
One of the first things the leader did was teach them about GS and GS rules. She built a good solid foundation. They learned the GS rules and history. They learned that GS was fun, but it was also work, and that the work could be fun. Teach them the GS promise, there's a coloring book to help. Sing GS songs.
What's interesting is at at brownie level, there were a few 100 girls in our city. At the senior level, there are 14, 7 of them had the same Brownie leader.
A few other bits of advice...
don't be afraid to ask for help
attending your regional meetings for support and advice
there are older girls who need to earn leadership hours or work with other girls for their badge work
Congratulations on becoming a leader! Good luck to you.