Plan Your Advertising Budget describes various methods for intelligently establishing an advertising budget and suggests ways of applying budget amounts to get the effect you want.
Advertising Guidelines for Small Retailer Firms offers guidelines to help you plan your advertising budget, select media, use cooperative advertising, and prepare the ad itself.
Do You Know the Results of Your Advertising gives pointers on planning ads and discusses several ways you can compare advertising and sales.
The Marketing Basics section of the Online Small Business Workshop covers some basics that can help with creating a plan for advertising.