If you are looking to have fun, then the best way to choose your team is 
by finding people who are interested and who you like to hang out with.  
Broomball is a fun activity for both men and women and can lead to fun 
stories to talk about later.  Make sure to find reliable people because 
every captain's worst nightmare is having several cancellations the day 
of the game, and then having to scramble to have to put together a 
makeshift squad.
If you are looking to win, be very selective when choosing your team.  
Have no more than 5 men or 5 women on the team.  Find reliable people and 
find athletic people.  Be prepared for friends to ask about playing on 
your team and you having to say that there is no room left on the 
team.