A 6:
The range of a spell matters when you cast it. Unless the spell specifies otherwise, it doesn't matter after that.


Q 7:
Concerning the bonus action spell rule: Is it possible to use a bonus action to cast a spell, and then use your action to ready to cast another (non-cantrip) spell? For instance, a sorcerer casting a Quickened Fireball, and then readying an action to cast another Fireball as soon as anyone else does anything. I ask because the bonus action spell rule only applies to spells cast that turn, not to spells cast during some other creature's turn using your reaction.