Let's look at this the easy way...
WHat are you planning? Let's say a Spring Fling..
Food-
Entertainment-
Games (break that down)
Clowns
etc.......
Remember planning a wedding be it yours or someoneelses? You broke each thing down and made a list. Cake, Invites, Guest list, Dresses/Tux, Place, Food....same concept.
Right now I have a Easter egg hunt, Seder Dinner, Teacher Appreciation Dinner, Summer Skate pass fundraiser....each very different in it's own way but each list I have starts with the basic notions of what needs to be done and then the details are worked in and volunteer duties come from that.
no???? Okay, then I would check out Martha Steward. SHE knows how to plan a party and did it for a living! Check her site or a couple books!
Kids, mom's got work to do...pen, paper, glass of Pepsi,big table, deep breath....what's first?
you CAN do this!!!!!