Mythic equip doesn’t drop.
To make one you need an item to have 4 empty slots and you put a combination of mythstones and it turns to a mythic. Some mythic has certain equipment restriction such as it’s only to be craft on a specific part of your gear (MH/OH/Chest/Head/Ring/Amulet)
Example: Cyclone mythic can only be crafted on your MH
List of recipe
For gears you can raise Item lvl by using peridot and item lvl using emerald.
But for the gears to be better you have to have affixes that has synergy.
When I was staring out Rubik’s guide help me a lot in crafting gears