Guild will be more in game in the futur, for now it's on mostly the forum, each guild have their own forum, and organize themselves via irc. (there's also a guild war organized by BDK16). For tourneys, just sign in when you see one open in the organized play forum, you can also try the "Gauntlet" or "A1 siege" which are nice but very hard challenges. For the League, i think it's too late for joining the current one, you will be able to join the next one, just posts that you want to play it in the thread of the next season, and GDC will tell you what to do if you have trouble to understand how it works.
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