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Think about whether you want to make a few larger posters on posterboard or many posters on regular paper to put everywhere. You could also choose to do both. Go to a office supply store and figure out your options. For continuity, and to make it easy for people to remember you and your campaign, you might want to choose a color scheme that you stick to in your posters -- red and black or blue and white -- whatever you choose. Avoid neon colors, as some may think it is too bright. If you're artistic, think about how to use your skills best. If you aren't artistically-minded, think of other ways to get people's attention. Stickers can also be fun, but might get expensive if you make a lot of posters.  Will you draw something, or create it on the computer? What kind of impression do you want to create -- professional, funky, well-organized? Do you want to include an image of you? Photo or drawn? Have friends and family look at it and give you suggestions. Once you've decided if you want to incorporate their suggestions, work on making a final version of your model. If it's posterboard, you're going to have to replicate it multiple times. If it's something you can copy, all you'll have to do is find a place where you can make the copies of your model poster.
Find paper or posterboard you like. Decide on how you will decorate your poster. Make a model poster.