You make a team sound like a regular club, like say.. going to karate every thursday evening for 2 hours and paying exactly £6.99 + Vat a session.
Generally it all varies.. and is more dependant on what you want to put in..
The Vast majority of teams, if you want to join them, just Ask, and see if they will let you tryout, or come to a training day with them, ect.
another good idea is go to a Sup Air walkon day somewhere and talk to people, see what they have to say..
As for experience, Higher level teams generally only want experienced players, but most teams will take you on with any level of experience, as long as you show a willingness to learn & train, your personal experience shouldnt be a problem.
As for Cost.. That is entirely up to you..
Depends on :-
1:- How Often you can Train.
2:- How often your Team train.
3:- How often your team travels to tournies.
(and most importantly)
4:- How much you choose to spend...
There are no real prequisites to joining a team..
The only thing is you gotta show them you want it...
P.S :- (Your own kit is usually usefull..)