That's okay, you too can still become a good /a/ poster!
If you have no good anime to talk about, you should peer around for anime being discussed that catches your interests. Occasionally, it may be hard (SOME SEASONS SUCK BALLS) but with a little help from google, animu news network, and the occasionally posted images of all airing series this season, you can find summaries of all the different series. If you still can't find anything, wait for someone to post a 'HAY I LIKE THIS THIS AND THIS WHAT SHOULD I WATCH? (I ALREADY WATCHED THIS AND THIS, THEY SUCKED FOR X AND Y REASONS)' thread. There you may find some good recomendations.
After watching some good anime, you can now participate in discussions!
From there, you can only go up. Soon you'll be forming your own opinions and sage-ing Code Geass threads like real /a/ pros!