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ABreedApart
Melee attackers should have STR and QCK. More STR is better than more QCK. If you have leftover points at level 25 after building your dragon, you can just toss them into VIT.
Mages should have INT and QCK, more INT is better than more QCK. They can also have leftovers tossed into VIT. However, if you're looking to do it quickly and efficiently, you shouldn't use mages. They're significantly slower than melee attackers.
Melee attackers should generally have scratch, two ambushes, three berserkers (you can use your dragons' flight-specific STR stones until you get to 17 to equip berserkers), a rally, an eliminate, and the remaining two are free spaces. I like to use contuse and sap in them for boss fights to lower the bosses' damage and get some health back, but this is personal preference. Some people prefer haste and sap. I've found haste doesn't do anything but slow me down with its animation.
For mages, you want meditate, two ambushes, three scholars (same with flight-specific INT stones until 17), and then... really whatever you want your mage to do. Since mages are so inferior to melee attackers in terms of efficiency, they're mostly just for fun. They mostly only have a use in Golem Workshop.
Element only matters for the flight-specific stones, which are largely obsolete by level 17 due to there being better stones for efficiency (berserkers, scholars, eliminate). The only one I can think of that is widely used is Disorient on wind-flight mages in Golem Workshop.
Anything else doesn't matter since you can always use a Tincture of Dissolution to reset the dragon's stats and overwrite its stones.
For any specific stats and stones, you'll want to look at build-specific guides. If you're building your first coli dragons, I'd recommend getting at least a Mire Flyer so you can train fodder and make money from exalting. You'll probably want that to be Rosalyn since she's Arcane element, which is the best for Mire.
If you want to be as fast and efficient as possible in leveling up your first dragons, check the Ice forums for the level 25 lending service. It'll make it way faster if you train them in a high level venue with a level 25 than if you trained them up by scratch.
https://www1.flightrising.com/forums/fl6/1951621