You can go to this site
and sign up for weekly modular knitting tutorials. Then, if u join the yahoo modular knitting group you can downloard all 14 of the tutorials right away rather than getting one tutorial per week. I did that and I recently order Iris Schier's Modular Knits. I'm afraid that I've only had the chance to glance thru the book & tutorial, but from what I've seen it's all that you need.
FYI, to join the group go to yahoo.com and got to 'groups' and put in "modular knitting' under the group search and you will be directed to it to join. It's well worth your time if u r interested in modular knitting