Mate
From what little i know......
Those will do nicely for standard 14g (2mm) diameter spokes. The 194mm length of spoke and those 12mm nips would work for a SR/Suzue small flange hub and alloy rim (Pro Class/Araya/Ukai) combo. I did a set recently. You'll need to check the correct spoke lengths for other combo's (lacing a Bullseye would probably take a shorter spoke).
If you're looking to lace up a set of Z-Rims you'll need longer than 12mm Nips. The Z-Rim is thicker than alloys so 16mm is the way to go, with a shorter spoke. The 16mm anno nips are pretty hard to come by. I've been looking for long red nips for ages now. Haven't had a bite anywhere
There's also the lacing pattern to take into account.....3x, 4x, straight laced? Sh*t, it's a real can of worms.
Check out some of the posts on the US sites, and Sheldon Brown for top tips (
http://sheldonbrown.com/wheelbuild.html)
Jim