Darrell hit it out of the park. Because you are in shape you are more at risk. Start slowly.
You certainly can do wrestling oriented WODs if you want. However, I have been running a CrossFit program for 3 years and its my observation that the people who make the most gains are the people who either have a CrossFit Trainer to guide them or do the workout directly off the front page. My observation is these people make the most progress because they cannot design or pick WODs that ignore their weaknesses. Just an observation. If you want the most out of the program do the workout on the front page for a couple of months. Identify your weaknesses. Then you can use that info to make yourself bulletproof.