When an Equipment with job select enters, you create a 1/1 colorless Hero creature token, then attach that Equipment to the newly created token. Each Equipment with job select works like other Equipment. Its other abilities will tell you how it benefits the equipped creature, and it can be attached to other creatures you control using its equip ability.

A Saga creature is also a creature and can do everything a creature can do. It can attack, although not the turn it comes under your control. It can block. If it has any abilities or flavor text in addition to its chapter abilities, those abilities and flavor text will be in a separate part of its text box under its type line. Saga creatures aren't on the battlefield for a long time, but they can make a devastating impact in their short time with you.

Adventurer cards are creature cards, but each has a set of alternative characteristics in a subset frame on the left of its text box. You may cast the card as its Adventure—if you do, you can cast it as a creature later.