On Using Scrolls and Magic Items

In this campaign, you do NOT have to have a scroll's spell on your spell list to be able to use it. You do have to be able to read the language in which the scroll is written. However, there is a chance for the spell to fail if you're not trained in it.
To trigger a scroll, you must speak the incantation while touching it. The scroll does not have to be unrolled, and you don't have to read the incantation as long as you speak it aloud without error.
If the spell is above your caster level (i.e. and/or off your spell lists) you have to make a casting check at DC (10 + spell level). If you fail, you lose the scroll and the spell doesn't go off. If you fail by 5 or more, you have to roll d% on the appropriate misfire table for:

  Divine Spells - Cleric, Druid, Paladin, Ranger spell lists
  Arcane Spells - Bard, Sorcerer, Warlock, Wizard spell lists

Magic items work the same way, but they often do not have their command phrase(s) printed on them.