When you begin playing in a new Season, you will need to complete a series of 5 placement battles. Upon completion of your 5th placement battle, you will be granted a rank.
During and after your placement battles, you’ll be able to view the Rank List to see the Rank divisions, tiers, and their associated rewards. Each division and tier (for instance: Silver II) has a Rank Point requirement, which can be viewed in the Rank List. The Ranked tab will also display your current Rank Points versus how many you must earn before ascending to the next rank.