The 0 just means you don't do it. Patterns like this are written out for multiple sizes; the sizes have different numbers of stitches, and so need different amounts of 'padding'. (The pattern stitch will only work for 8x+5 stitches; the third size in parentheses has 6 extra stitches, which isn't enough for a full pattren repeat, so it puts those stitches on the edge. The size you're doing is exactly 8x+5 and so doesn't need any padding.
Working in eyelet stitch across center (which for you is the whole thing) means to follow the pattern listed above: k1, yo, CDD (which it probably tells you elsewhere how to do), yo, k5, yo, CDD, yo, k5, continue repeating the yo+CDD+yo+k5 all the way across until you run out of stitches; the last time you do the repeat, you end up with k1 *instead of* the k5.
(Really, if you find it easier to think about, it's k1, then yo+CDD+yo, then k5, then yo+CDD+yo, then k5, and repeating the yo+CDD+yo with 5 knit stitches between them, then k1 at the end of the row.)
Isabeau * 'isabeautiful' on ravelry
I knit, therefore I am.
Current projects: a hat, one pair of socks, a pair of fingerless gloves, and zero sanity. Future projects: more socks, more gloves (some with fingers, even!), a tea cozy, a penguin scarf, and even less sanity.