I cannot help but smile when reading this… 
I am afraid that Glyphs are really difficult to get and hardly farmable (their drop rate in chests is reaaaaaaaally low). But to answer your question (taken from the New Player Guide):
Glyphs are one of the most important but hard to collect resources, used for Legendary and Mythic minion evolutions, for upgrading the Spell Book and Battle Scrolls past level 35 and for some options at the Forge. Glyphs can be obtained in the following ways:
- A once-a-week Glyph purchase for 30,000 gold in the Shop > Resources > Shards & Glyphs (restocked on Sunday). This deal does not become available until you complete the Main Story on at least one character or reach level 50.
- A once-a-week Glyph purchase for gems on a weekly rotating schedule (Monday - Weapon, Tuesday - Armor, Wednesday - Accessory, Thursday - Spell, Friday - Minion [3x] )
- As silver&gold rewards from Tier X and above Kingdom Defense, at a small drop rate (2.8% for Tier X - 4% for Tier XX)
- As rewards in certain Adventures.
- Very rarely in Kingdom Bazaar or Daily Deals (Kingdom Bazaar should be max Level 10 to increase odds of Glyphs showing up).
- Within iron or better chests, but at an absolutely low drop rate (probably lower than 0.01%)
- For those wishing to purchase Crowns, Glyphs can be found as premium rewards in the Quest Pass and can be purchased directly from the shop.