Well I open my circle and recite the witches rune, say an invocation to Artemis (or your goddess if you're gardenarian wiccan) and then I use some moon water in my altar and say a prayer to my goddess and thank her for this month and if I have any spells I want to do I do them then. Afterwards I thank her once more and finally close my circle and viola I'm done. But then I set out more water to make into full moon water.
There are plenty of rituals you can perform, depending on what you practice. Personally I go to my local graveyard and offer prayers to and for the dead. Also, I pray to the spirits I follow. My space is also limited, so are my funds.