Hey, welcome to the league! I've noticed you signed up for UPN as well, and that's great! Thing is there is a problem for people posting for the first time over on UPN, so if you notice that you're unable to post, send a PM to a 'Lady Kuno', who is the owner of the site. I'd also advise getting your squad of 15 together before you go into your first battle, so that if you accept someone elses challenge and end up posting your squad second, you have more options to work with.
Any other questions feel free to ask, and I hope you enjoy ASB!