I just bought a bunch of cranks in the past weeks. I'm going to give it a try as soon as I can get the time. The MS forum sticky has an unbelievable amount of information and posts in it. It will take you a while to read but has a lot of good information in it. Some things that I have gleaned from it are:

1. There are several different ways to pull/push cranks.
2. You can either control your depth solely by the amount of line you have out or with some type of weight a few feet in front of your crank.
3. People catch them at speeds from 1.2 - 3.0 mph. (Very wide range) Most seem to stay between 1.5-2.0 mph
4. Rod holders are very useful if you don't already have them.
5. Most folks use line counter reels for this. The most popular models being the Okuma Magda and Diawa (some number I can't remember).
6. A gps and lake chart will be very beneficial to you. (seems to always be true)
7. Gear cost for this can REALLY add up in a hurry!

If you're serious about getting into this, read that sticky. There's a lot of crap slinging over there (all in good fun) but there is plenty of information too. I have yet to start my trial and error process but it seems like a real good time for the dog days of summer.