I am currently working on a magic system for a novel & for an rpg.

there are 3 divisions of magic, ritual, spell casting & artificing. ritual takes time & requires the correct equipment, ceremonies, incantations, drugs, dancing, drums etc. spell casting is the on the spot spell use, such as light, fireballs, levitation and such & artificing is imbuing items with magical abilities.

there are 2 schools of magic hermetic & shamanic/druidic, hermetic is the more scholarly, studying books, developing components, magic circles etc & shamanic is traditional ie you use a holly branch & wear a wolf skin because your teacher used them, the ritual is more dancing, drumming & taking magical (hallucinatory herbs) than candles & circles. though unknown to the practitioners, 2 hours dancing around a fire creates the circle just as effectively as 2 hours drawing a magic circle with the correct runes & symbols, the candle is fire just as much as the bonfire & the sacred pool is a reflecting liquid like the chalice of mercury)