How to configure mask attack

[Znerox]

I'm trying to do a mask attack on a WPA hash, as described here http://hashcat.net/wiki/doku.php?id=mask_attack . How do I set it up to try all lowercase alphanumeric characters and a password of 1-8 characters? And what kind of performance can I expect on a Nvidia GTX285 (Windows 7). Currently I'm getting about 13k/sec with the newest driver (310.70). Thanks