There are many important things you need to plan out, decide and remember for your shower and thus it's equally important that you have a Bridal Shower checklist to keep track of these important things and check them off one at a time.
Hosts: Before the party even starts you need to sit down and figure out who is going to host and direct this big bash. Traditionally it's the Bridesmaid who does most of the bridal shower planning, and consequently she is also responsible for the expenses. However you can probably work something out where a collection is taken up to help cover the expenses. Don't forget to set a date for the party so you can make a timeline.
Guest list and Invitations: It's very important to have a guest list and after that to remember to make up and send out invitations. Otherwise no one will show up.
Decorations: Pick a theme, any theme and start looking for the decorations to go with that theme idea. In general you'll need ribbons, flowers, balloons, streamers, baskets, tableware and silverware, favors, candles or potpourri, table cloths, lighting, banners, etc.
Food: It's what feeds us all and guests will love a sampling of snacks or even a full course meal at the bridal shower. Decide on a menu and get cooking.
Activities: You'll need to fall back on some games and entertainment in order to keep the going or give it a little jumpstart from time to time. One I recommend is the Who Am I' game in which you attach a piece of paper to each of the guest's backs as they arrive. On this sheet will be the name of a person or general description and guests will have to ask each other questions in order to figure out who they are.
Before the shower starts check to make sure you have enough food, favors and supplies for all the guests you are expecting. Cook any food or heat it to the proper temperature. You may want to set up the decorations the night before to save some time before the shower the next day.