I moved your post because it was in the wrong forum. Knitters Knear You is for finding people to knit with in the area where you live. Questions about how to do something can be asked here or in the How-to Forum.
Are you a new knitter? We have a glossary linked at the tab at the top of the page and lots of videos, too.
1x1 ribbing is k1, p1
2x2 ribbing is k2, p2
The length just refers to how tall you want the collar. I suggest for a bunny you do a very short mock neck, maybe 1 inch...they don't have much of a neck and a turtle neck would probably hide their face. :lol: