Only a few I can think of..
1- How much?
2- How often and where are practices
3- Are uniforms included and how much are they?
4- What about other school sports during off season and if it affects missing practice
5- How many girls are on the team
6- Do they play one position only or learn multiple?
7- if older ages do they play or HAVE THEY played showcase tournaments like Compuware or Stingrays, not "we are going to try" Big difference there. Some lock out unknown teams.
8- How many out of town tournies as this could cost 75-100 a night
9-seek out some returning parents to get an insight on the team if you can never hurts
just some to start... Good Luck!