This is a very basic traditional list of things that one would find on many styles of alters transcending different religious and cultural back grounds.
Athame:(ceremonial knife /dagger) directing energy, casting rituals
Bell: stop start a ritual/ clears energy
Candles :draw in spirit, represent the elements, deities or chakras (coloured ones)
Cauldron :burns herbs and incense
Chalice :holds ceremonial drink
Offering dish gifts for deities
Pentacle: represents all the elements & protection
Wand :casting circles and directing energy
Herbs, Oils: herbs for offerings to deities, oils for candle spells
Statues: Representing the gods or goddess's that you are giving honour to
Crystals: Each one resonates to a different healing frequency and should correspond to your alter "theme"