New cards have run out and I was wondering why when I realized the deck is called "Japanese Core 2000 Step 01 Listening Sentence Vocab + Images" and checking ankiweb.net shows there are 10 steps.

So before I continue, should I download the next deck (Step 02) and continue with that or should I get another deck that is more preferred by users from this site? Any suggestions about which deck is best for core 2k?

I also keep hearing about optimized 2k6k decks but I'm not sure what that means or if it would be better.

I would download pmnox's core 2k/6k/10k deck:

https://ankiweb.net/shared/info/702754122

http://forum.koohii.com/showthread.php?tid=11095&page=1

The description on ankiweb explains everything pretty well. It would be easier than having to download multiple decks (step 2,3,4...).