Thanks for reaching out! Whatever solutions work best at your table are great, but here's how I do it:
1-Spells Autohit...Unless you'd prefer to roll 2d6 + casters attack vs. Target characters.
2-7 standard, 5 easy, 9 difficult, 11 hard
3-Yep! You got it. Unless something works better at your table.
Thanks again for playing our game!