Tournaments are available on the PTCGO! Standard format tournaments and Theme format tournaments are available 24/7 (with fee and prize structure changing every two-three weeks). Weekends will have pack-prize and ticket-prize tournaments (with formats changing every weekend). You can find the prize structure in the TCGO client when they're available.

State/Province Championships are happening this month and next! Will you be competing?

The in-client store's products consists of theme decks (LTR-on), 5-card packs (NXD-on), and a 1-pack blister mimicking those found in the checklanes of big box stores like Target. Every now and then, other products like 3-pack blisters and products mimicking IRL value products like boxes are available for a short time.

The best decks for beginners and theme deck tournaments are still as follows (But not in terms of consistency)...

>Yveltal/Xerneas Battle Pack
>Red Genesect Collection (not available in the TCGO)
>Resilient Life
>Psy Crusher
>Destruction Rush
>Dark Hammer
>Ocean's Core
>DragonSpeed

Any starter deck released before LTR cannot be found on the in-client shop and must be redeemed from a code card.

PTCGO client:
>http://www.pokemon.com/us/pokemon-tcg/play-online/download/

Decklists from Worlds:
>http://www.pokemon.com/us/play-pokemon/worlds/2014/decks/popular/

News for TCG:
>http://pokebeach.com/

Standard Legal card list:
>http://pokegym.net/forums/view.php?pg=stdformat

Tier list for Tournament-level decks with skeleton lists (does not include rogue decks like Exeggutor PLF and the like).
>http://www.pokebeach.com/forums/forum-metagame-deck-discussion

Your old cards aren't worth shit don't ask. To learn what your digital cards are worth, look for the Top Cut thread on the PTCGO forums in the trading section. Your pack codes are worth about 25-30 cents while other codes are worth around a dollar or two.