Basco, do not join the first Squad that offers you.
Hang around with any squad that you are interested in for a while. See if "the shoe fits". Then join.
There are many good squads out there, and most will take in a nowebie and help him get going. If they do not, scratch them.
Most important thing there is for YOU to enjoy their company and to have fun.
Are you more the fighter type?
Do you like a loose group that just flys together at times and has fun?
Do you want to have a lot of teamwork/mission kind of gameplay?
Do you prefer a military command structure or do you rather like a loose bunch of friends?
All those are questions you have to consider before selecting a Squad.
Choosing a Squad in Aces High might help you.