You don't want a starting hand full of cards you can't play, so avoid holding on to cards like Hades, Lord of the Underwold and Flotsam, Ursula's Spy
Avacyn, Angel of Hope, depicts the archangel of the frightful plane, created by Sorin Markov to protect the plane of Innistrad
This one is the much more interesting question
TLDR Pick Modern if you want the normal MTG card look and maximum readability
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Experience the magic of Disney Lorcana with these high-quality collectible cards PERFECT GIFT FOR FANS: Whether you're buying for a seasoned card collector or a Disney enthusiast, this Disney Lorcana booster display box makes an excellent gift