You can use the Lorcana app, a token on the playmat, a 20-sided dice, or pen and paper Determine the first player by flipping a coin, rolling a die, or so on
Commonly, uncounterable spells are expensive green creatures or blue creatures that would otherwise be incredibly vulnerable to counterspells, like Tyrranax Rex
As a Commander, the robot side Blitzwing, Cruel Tormentor makes more sense since it has a nice triggered ability of making an opponent lose double the life lost that turn
The restricted list and high power-level of those cards can lead to swingy games, but it's also part of the fun
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