Answer: It sounds like you need to build terrace beds. It's hard to describe how to construct these without illustrations, but the best image I can conjure up is that you build 3-sided raised beds to create "steps" up the slope. You can use landscape timbers, stone, or any number of materials to make the terraces. You may have to adjust the grade of the slope a bit as you go to accomodate the frames, and might also have to bring in soil to build up what is there, depending on the quality of the soil and its nutrient levels.
Many garden planning and landscaping books have plans and instructions for building terraces. Go to you local bookstore, garden center, or library for ideas. Best of luck!
Q&A Library Searching Tips