People put too much emphasis on technique in kids shows. Kids shows are easy. Make cheesy jokes once in a while, be silly, and have fun.
What tricks you want to do are up to you, but pretty much any OK stage effect will do.
Just make sure to appeal to the kids.
I respectfully disagree. As a magician who has performed professionally and semi-professionalf for kids over the last 25 years, take it from me that kids are perhaps one of the MOST DIFFICULT audiences to perform for.
One of the key reasons is that kids believe anything is possible. So, it's much more difficult to pull anything over on them. With adults, our ability to think logically often works against us when viewing a magical effect.
Secondly, kids have an extremely short attention span. As a result, it is absolutely essential to have a well thought out, well routined, and well practiced show. There's nothing more embarassing than seeing children leaving in the middle of your show.
Third, you are actually performing for two separate audiences. The kids who are attending the function, and the adults who are paying you. If you do a sh***y job, with little or not preparation or effort, you will never likely get rehired or referred again.
YOU OWE IT TO YOUR CLIENTS AND YOUR AUDIENCE TO PUT TOGETHER THE BEST SHOW POSSIBLE. OTHERWISE, AS JAY SANKEY ONCE SAID, "THERE ARE A LOT OF STAMPS TO COLLECT!"