Steve Kish the Magician has performed at hundreds of events like yours each year.  He has suggested best practices for your event planning.  Below are some easy ideas for decorating a Magic Birthday Party:

Here is where you can order Magic themed stuff goodie bags:

http://www.orientaltrading.com/

http://www.orientaltrading.com/magic-wands-a2-70_3571.fltr?keyword=magic+birthday

http://www.rtdtrading.com/shop/main.cgi?mproduct&RTD-156012&gclid=EAIaIQobChMI9aPpyoPT1gIViB6GCh1BugYoEAQYDiABEgKi8vD_BwE