Congratulations!!
We never had a specific theme with our parties. We've thrown several DJ parties from the most elaborate at the country club with the room like a dance club to our back yard for halloween and a costume contest.
If your school has dances, they would know a place to get a DJ that plays the "clean" versions of the songs. Also, are you a member of a country club? Our club has references for DJ's and bands because they are often the place for a wedding reception and lots of DJ parties.
Around here, you can get a decent DJ for about $500 for 3 hours and you can spend a lot more for a "name" that kids may know from the radio or something.
We always have our parties with "no gifts please" and then the DJ has contests where we gave out prizes of I-Tune gift cards, and IPod. This was a few yrs ago.
I like your glow idea... Oriental trading has a lot of glow items, check them out. This is the time of year they offer free shipping on a lot of things.
Do you have your venue? Are you in charge of all decorations? Then decorate in the blue theme.
Are you having food? we did a buffet with chicken fingers, pasta and baby pizzas and then had a make your own ice cream sundae bar.
One thing we ALWAYS do is hire an off duty police officer. THis just helps keep the good kids good and anyone not invited or not so good away from the venue. Our rule of thumb is ......IF you levae the party for ANY reason, you do not come back inside the party venue" This just keeps kids fromn going to cars, possibly getting into things they don't need to get into and bring them back inside.
Don't stress ad Have fun!!