Spellcasting in the world of Viking is mostly tied to the characters guild. In some rare instances however, a particular item, for example a book or a scroll, can provide a temporary access to various spells, but these are few to come by, and are (usually) no real match to powers granted by the guilds.
Most spells costs Spell Points to use.
For guildless newbies there is an item found in the Adventurers Guild that will grant the player 3 base spells. See diploma for more information about this.