I would say perform:
Revolution (make sure you have all your angles down!)
TT and silk (If you do not have a patter to go with this, find some good music that would go well with this, download something from Amon Tobin.)
Hummer Card (Use thin IT for this, if it is close up make sure it is very thin!)
D'Lites (turn the lights off while performing, tell them the spirits only come during the night so maybe we can fool em by shutting off the lights)
Magic coloring book (make sure u have a good presentation down)
Vanishing Milk (same as magic coloring book)
Magic Towel - one with hand prints on it (use this the first time u ask for a volenteer, tell him u must make sure his hands are clean)
B-Day cards - show individual cards, put together and they change to large B-Day banner. (Use this as your closer!)
Sponge Balls - 4 of them (A good sponge ball routine would be fun, make sure u have it well mastered though)
Bite out of Quarter (they're kids so ull be safe with a simple finger palm switch for this one)
Dollar thru Quarter (watch your angles with this one)
Pen Thru Card (this would be pretty neat, when u do this show them up close, well as close as you can get without exposing anything)
Eggs from mouth (if u have this one well mastered, do it! kids love it!)
As for the order of the effect and as you said the structure of the routine, in my opinion, I would perform eggs from mouth as my opener, with a good opening presentation, you know introduce yourself, then load the gimmick undercover of coughing, then act completelly surprised, and begin to produce the eggs. As for the rest of the tricks, put them in an order that goes well for you, put some of your ideas into the effects, since this will be your first show, later on one u have done a few shows you will change things, but for now I would say start working on it now! Make sure and this is very important, make sure to rehearse your show a few times before the real thing! Like Sankey says dont just practice rehearse! It is very important, that will help you alot with the presentation! Anyway hope this helps!
