Mythics...

Let me tell you this.

Mythics are obscenely rare, and the only reason people find them is that because they're exceedingly dedicated to find them, and it only appears when an absolute stroke of luck is had. I've played this game for countless hours on end and I've only been able to find two (in a span of T W E N T Y F O U R H O U R S). Don't worry about not finding one.

When it comes to finding them, you need to be exceedingly lucky. Loot Quality makes it much easier to find some, but all gear dedicated to that ID is crafted, so you might have to craft yourself some (they're lv 100+) or buy them from the Market.

You can also buy one from the market - create more classes, level them up to max, do all quests, rake in LE, buy your favorite Mythic (YMMV - some Mythics can set you back double-digit stacks of LE).

 

Find Ingredients, level up your Gathering skills as you level up your Crafting skills. High level Gathering skills such as Mining pay out well, as certain materials and ingredients are in high demand.

Especially save up the Loot Quality ingredients. You can either sell them for bulk or use them in creating LQ equipment. Which also sells for rather high prices.