Training is required to equip an Implement. Implements come in a variety of classifications, such as Focuses and Talismans; training in the listed classification is required to equip the Implement. Training is commonly provided by a Class.
Many Implements provide special mechanisms for beginning Incantations.
More powerful Implements have a level requirement provided. A PC's level must be equal to or greater than the listed requirement in order to equip the implement. Such implements typically have a Magic entry as well, which is used to add Magic cards to the combat deck. They also have an Extra Effect provided, which adds some additional flavor and fun when equipping the card.
For more information, see Player's Guide Chapter 7: Gear and Wealth.