Tokens follow almost the exact same rules as other permanents (unless some rules specifically care about their token status), except that they cannot exist outside the battlefield
"Typically, they perform five days a week for seven hours each day
3 Level 7 monsters While this card is face-up on your side of the field or in your extra deck when you toss a coin or roll a die, you can choose heads or tails instead of tossing the coin or a number from 1 to 6 instead of rolling the die
Qualifier tokens will be delivered through the MTG Arena player inbox
You may choose any letter from any language, including Spanish, Phyrexian, and that secret language that only you and your twin sister know
As for what cards you want to collect to upgrade, Id recommend picking up 5,000 Years in the Future packs