A spell isn't necessarily an organized set of words: they can be anything from a silent wish to an intricate layout.
Rituals are, as previously mentioned, done in a religious setting. Often for many witches that means doing them in correlation with any holidays they practice, as well as doing them at an altar, shrine, or similar. But that is not always the case - as with Wiccans, generally rituals are proceeded by the opening of a circle. There are a number of ways to do this if you wish to include it in your path.
Anything specific you'd like to know, feel free to ask!