I agree, organizing a party for your child can be very stressful, but accomplishing it successfully, and seeing how much your child enjoyed it, is totally worth the stress. I use
Creative party theme ideas and supplies for kids, teens and adults - Themeaparty.com for all my ideas, and I buy a lot of stuff from them to use at my parties. They walk you through everything you need to know to have a great party and I honestly just don't know what I'd do without them. I would highly recommend you check out their site!