I’d also suggest looking at [0.8.5f] Heavy'z Casual Loot Filters for all Classes v2.8 which was made by an very active community member. You can likely get some ideas from what he’s done there.
You don’t have to create a new loot filter every single character, you’ll just likely need to import one that you need, that you can then modify to support that character’s needs. Not every sorcerer is a fireball casting sorcerer, but they are still sorcerer’s, so they’ll have things in common.