I hit 80 a while ago but I took a break from WoW before Ulduar came. Now that I am back I was wondering what I can do to get more hp. I am always being kicked or doubted by members of groups for heroic dungeons before they even start just because I only have 24k. I know skill-wise that I can keep threat well and the few heroics that I have done, (VH, Nexus) have gone relatively well.
I have read a few gear guides but it seems that I need to nab a few items from heroics that I apparently can not yet tank. I am asking kindly for any advice or input on what I should do to make my character more geared for heroics without actually doing them.