At level 30 you get the quest for your aerocraft.
Elves have wings from level 1 but only the Cleric has sufficient mana for sustained flight at that point.

-If you decompose gear at a Tailor/Blacksmith, you will obtain Chi stones. Drag these stones to your equipped aerocraft to charge it.

-Molds are used to create legendary gear. They drop from dungeon bosses sometimes, or very, very rarely from regular monsters. The forges to make Legendary gear are in Archosaur, Southwest district.

-Mirage Celestones can be obtained by trading 3 of each (human, earth, heaven) celestone or 25 celestone fragments at a Gem Merchant. They're used to refine your gear at an Elder, which will enhance its attributes, and even add new ones. Note that if the refining fails, you will lose the refining level the gear had (i.e. if you had +3 and you failed, it returns to +0). The Mirage Celestone is also lost, even though you failed.

-Shards may drop from monsters, you can get them from Lucky items (Lucky Note, Lucky Pack, etc), or you can buy them off Merchant NPC's. Also, you can use three soulgems to create one soulgem of the next level, at a Jewelcraftsman (Combine option). If you imbue these soulgems into armor/weapons, the effects will be added to it. Note that your item needs one open socket per soulgem, and the success rate is 100%. This is done at a Blacksmith or Tailor.

-Gear glows under the following circumstances:
The following weapons glow:
-Three-star (purple name) : Blue glow. Obtained at lvl 20 from a quest, or rarely from weapon manufacturing.
-Legendary (gold name) : Gold glow. Obtained by using materials and a mold (dropped from dungeon bosses) at a Legendary weapon forge in Archosaur.
-Twilight (green name) : Green glow. Obtained by using Twilight Temple materials at a Twilight Weapon forge in Archosaur.
-All fists

Also, you can make armor glow by adding soulgems, here's a list:
2 grade 5 hp stones = purple glow
2 grade 5 phys def stones = orange/reddish glow
2 grade 5 mag def stones = white glow
2 grade 5 mp stones = blue glow
2 grade 5 evasion stones = yellow glow
2 grade 5 elemental stones = green glow
2 grade 5 stones, not the same = sparkles
4 grade 8 hp stones = lightning effect
4 grade 8 mp stones = blue crystal effect
4 grade 8 elemental stones = Strong green glow with sparkles
4 grade 8 phys def stones = Burning fire
4 grade 8 mag def stones = Strong white mist
4 grade 8 evasion stones = Bigger/stronger yellow glow with sparkles.

The Friendship Quest is a daily quest to recieve 15 000 XP.
Details can be found here.

The BH or Bounty Hunt is a daily quest for player level 30+. (You have to fly to reach the NPC) The quest involves killing a boss of a FB cave 2 FBs before your next.
As an example: Level 49 players would need to kill a boss in the FB 29 cave. Level 89 players will have to kill bosses in the FB69 cave and so on.
Rewards vary per level but are very worthwhile.

When you run out of quests and you still need XP to level, usually starts at around level 40+, you can form a Zhen squad to grind mobs faster. A full explanation can be found here.

A long(ish) quest to get a massive amount of XP , around 2 million.
See Gamma Rebirth

A very quick quest to get a large amount of XP and SP.
See Daily Quest - Crazy Stone

Only Venomancers can use pets.
That being said, there are "All Class" pets that any character can have following them, but these cannot attack and only 'look pretty'. They are also quite rare and VERY expensive.