well, just so you know. the 4 emerald dragons and kazzak are way to hard for rde, the dragons take tons of nature resist and kazzak takes a perfect 40 man raid. azuregos on the other hand is pretty easy and is doable with 30 raiders without uber gear.
azuregos spawns just above orgimar in azshara, he walks around in the east part of azshara and when he is up you will hear yells in azshara that he is walking around. he is usualy only up 1 hour or less becouse he is killed most of the time very quick.
if you are going to try him these are the things you need to counter if you want to kill him:
-Azuregos periodically gets a magic reflection shield, if it is up all magic spells cast on him will get reflected on yourself, very anoying. a warlock for example will dot himself up and is becouse of that killed by his own dots.(this happend to me a couple of times), ct raid assist will anounce when the shield comes.
-Azuregos periodically teleports everyone under him, this is the most anoying thing of the whole fight, he is doing that all the time and you have the time for 3/4 actions and than he teleports you again. that is why dots are so important in this fight and all priests should use swp, warlocks need to dot him full up. also the agro is wiped after a teleport so you even need to give the tank a couple of seconds.
-Azuregos casts a blizzard-like spell that burns the mana of any caster caught in its range. this is why it is important for casters to run a short distance away from the dragon after a teleport. Mages should blink immediately after a teleport.
-if you die, you can just run back to the fight(gy is very close), but if you die, Azuregos will give you a mark for 15 min. the mark means that you freeze if you get close to him. stick around tho becouse he takes normaly around 30 min or more to kill.