1. True weight - loss rituals, are found at the high end of folk magik.
For a person, who's new to the practicing arts, it's too dangerous.
2. As for protection rituals, and meditation, there are many excellent guides, on this site.
You can use the "newbie central" and "faq" tabs, found under the "home" tab. Or, just use the search feature, at the top right of the forums.