Not sure about the crawlers, I always try to use pretty small bait on the ice going after panfish. Would guess pieces of crawlers would do.
I've never gone through the ice, but here is a youtube video you might wanna watch on getting back out. Falling Through The Ice. Was posted on Ohio Game Fishing. To make you feel better, take along...... Hand ice picks, a PFD, safety rope, I started carrying a whistle around my neck, put your cell in a zip-lock bag, there are probably a few more....
Yep..... sounds like you are hooked now! :D Have fun and be safe!