7 – Can I choose to select 0 where it says “up to” when playing the Adam warlock events, Karmic blast or…

No. When playing Karmic Blast or Cosmic Awareness, you must discard at least 1 card from your deck. This is because these events have discarding as part of the cost of their abilities, and the updated rules for costs make clear that “a cost requiring ‘up to’ some number of game elements requires a minimum of one such game element.”