Generally you want to use all available cooldowns slightly before then directly after applying straight shot, then applying your dots and then barraging a heavy shot after those are up. If you want to get really fancy, you can reapply those dots once your shortest cooldown is sitting at 5 seconds so you can clip a second set of dots with all cds again. Not necessary but it's a dps increase generally. Definitely easier to do once you get iron jaws. I don't recommend using macros for very long, because they slow your output significantly. Just find a rotation that works and get it committed to muscle memory while you're leveling. Get into a habit of spamming your bloodletter button once you get the river of blood trait if you can. Use battle voice generally on pull with foe requiem up (even healer dps can get a good bump up with it). Don't worry too much about singing songs in dungeons or anything unless your damage is super low, resources will generally survive if dps is good.