I am on my 7th year and now I am a leader to Juniors and Cadets. I started out as a parent volunteer. I am on our Leader Support team as an Age Level Consultant and Recruiter/Organizer now.... we need more of you.
This is how we do it in our Council... I would first start off looking at your Council website and then contacting their office and meet with a Membership Specialist or the person in charge who trains and guides new leaders. You can check the Couwebsite for more info and who to contact. You could eventually get hooked up with a Service Unit which is a group of troops in your immediate area. You should start training and each Council handles it differently so be sure to inquire.
There are rules and there are certifications that you must obtain, such as CPR and First Aid. There are other required certifications, such as for camping, but again it also depends on your Council rules and requirements. Also, Safety Wise is a book that lists all the safety rules and regulations. That is what we all go by. It is the certification process that differs among Councils.
Yes, it is a lot of paperwork/regulations/rules/etc and it is overwhelming at first, but it is for the safety and protection of all adults and girls. After a while, you get used it.

I just make sure to be organized and place everything in file folders and a binder.
As for tips, I agree with getting the parents registered. It would be ideal if you can get someone to commit to being your assistant or co-leader. If not, you can rotate responsibilities between each parent and make it a requirement in order for your troop to function. No participation means no troop. You need a second adult and Safety Wise spells out the required ratio for the number of girls in your troop among many, many other things, such what activities are permitted, etc.
There are a lot of online resources. It's best to check with your Council for particular requirements, of course, but for things like SWAPs, meetings ideas, and such, there is a lot of info at your fingertips.
From our last Council meeting I just learned that nationally in 2008 there will be a new division of age levels:
K to 1st grade - Daisies
2nd to 3rd grade - Brownies
4th to 5th grade - Juniors
6th to 8th grade - Cadettes
9th and 10th grade - Seniors
11th and 12th grade - Ambassadors
For 2007 your troop would fall under the current age levels and requirements and gradually transition. Girl Scouting is changing ... and thanks for being part of this change and being a leader to the girls.

There are a lot of GS leaders and parents here - yay to all of us!
