Instance in OgrimmarFollow

Can someone tell me where are other bosses in the instance in Ogrimmar?I can find only one (i can't remember his name),his something like giant...but in atlas i can see that there are other bosses...where are they???

Yeah, skip Ragefire Chasm unless you want to finish all the quests for it. You should be leveling up to Wailing Caverns quite fast anyway. Just make sure you do all the prequests for Wailing Caverns while leveling. A little research here on Alla should help you do that.

On my Warlock, I did Wailing Caverns (with all the quests) in one run at level 18, and leveled to within an inch of level 20. I also upgraded almost all my gear through it. After that, Shadowfang Keep took care of the rest of my gear.