Get a copy of the Xcel Code of Points.
Look into leotard / warm ups / bags / meet prices as well as USAG and State registration fees.
Talk to parents about if they would even want a team- have a meeting. Give parents some rough numbers. Find out how many meets they would want to attend, how far they would be willing to drive, etc.
If you could "pre-evaluate" the girls to see where they are currently based on competing both maximum and minimum skills, you might have a range of divisions to consider starting with (not everyone would necessarily need to start with Bronze).