The least expensive resorts on property are called Value Resorts. These include the three All-Star Resorts and beginning in March next year, Pop Century. Two rooms at any of these resorts will be your least expensive lodging option. To decide on passes, you should have an idea of what type of touring you want to do. Do you want to visit only the theme parks, or do you also want to visit the Disney water parks and Pleasure Island? Disney has MANY options for passes, but the most economical admit you only to the 4 Disney theme parks. As for meals, you can run the gamut! There are very expensive full service meals and reasonably inexpensive counter service meals. My best advice would be to take a look at the planning section of this website for information on resorts and passes. After you have an understanding of what is offered, perhaps you will be able to be more specific with any questions.
Good Luck!