Thanks for the welcome everybody – feels like I am amongst friends already

Long post to follow – skip to the end to avoid boredom, or get coffee and cheesecake and (hopefully) enjoy the read! (and what for some of you level 80’s might be a trip down memory lane!)
Well I did it – After basically levelling through the second half of the 60’s during last weekends Call to Arms [crazy XP in there and I was sooooo sad to do that last Eye of the Storm as a lvl 69 prot pally lol >:-) got honor capped and spent it on the wrathful bracers] – I got some quest rewards from Borean Tundra/Howling Fjord and a few bits and pieces from the AH and queued as a tank using Dungeon Finder!
The queue didn’t last long

(especially considering my wife is levelling a holy priest along side my pally!)
So before you know it we are in the nexus, I have DPS’d all the 5mans as a lvl80 feral druid (didn’t go in while I was levelling) so I knew the instance but never as a tank (apart from popping bear VERY occasionally on the odd occasion when the tank has died, which doesn’t really count!)
Fortunately someone else had the leader flag so that took a little of the pressure off and I had read a little about tanking the bosses. But it was still more than a little nerve wracking. Fortunately we had no insane suicidal DPS, once the obligatory mage had ‘left raid’ because we weren’t going fast enough :p and things progressed relatively well through the trash once the boomkin had realised that I was meant to pull and not him!
Me 71 pally,
Healer 71 holy priest
69 rogue
71 boomkin
70 mage (after 72 left!)
On the first boss fight, Grand Magus Telesta, we wiped

All was going great holding aggro and my mana bar full, the heals were landing health bar was fine.
Then…….
Healer is oom at about the point she splits and as you can imagine things go downhill pretty rapidly from there!
We head straight back in and this time we take her down, again priest runs out of mana but right at the end of the fight (last couple of % so no worries.)
On we go cutting a path through the trash up to the next boss, Anomalus, raid leader instructs DPS to concentrate on the Chaotic rifts as they form, and for me to hold any Crazed Mana Wraiths that escape before it is destroyed. DPS pretty much ignores these instructions and again we wipe

don’t you just love PUGS!
Give them their due though we are straight back in and this time it all goes smoothly, druid innervates Priest towards end of the fight but we would probably have been just OK anyhow.
Ormorok is defeated with no difficuties, pretty much everyone keeps off the spikes

Then we headed back for Keristrasza. I’m going to tank a dragon

Again we go through the tactics, how to avoid the debuff and so on. I found the moving and tanking quite difficult here and I may have contributed to the wipe that followed

I didn’t keep the boss still enough, in my defense however I was doing what I was told (how many times have we heard that used as an excuse before!) Again the priest goes oom and we are sooooooo close to downing Keristrasza but I die and the group wipes.
First time to avoid the debuff I was told to move, the raid leader modified the information to jump on the spot and second time was much easier! However the healer still ran out of mana right at the end of the fight, but my bars were full so we comfortably finished the fight off.
And by the way the only thing that dropped for me were the shoulders from Ormorok, which although nice I didn’t want to trade for the heirloom shoulders that I am wearing (and I lost the greed roll, lol.)
Well done for reading this far, or alternatively cheater for skipping to the end!
So on to the questions :p
How big a mana pool would you expect a lvl71 priest to have?
(I know this is a tanking forum but I am sure you all have at least a passing interest in what healers get up to!)
Is it normal for the healer to end a boss fight oom?
(I am presuming that as we were all about the right level for the instance and not way over powered that we found it difficult but ‘doable’ as was intended – it certainly was fun – am I right in this assumption?)
Is there anything that I can do to make the healer’s mana last longer?
(Apart from ensuring that I hold all the aggro of course!)
Do you recommend that I quest a little longer, my gear is still shocking in a couple of slots, before going into any more instances?
(I will of course trawl the AH regularly for improvements. What libram should I have at this level, because I am pretty sure it shouldn’t be the one I have and that’s the only one I’ve got!)
Should I respect immediately due to any terrible errors or omissions?
(I was planning on a respect at 80 to sort out all the little faux pas that I have committed along the way with my spec! Same goes for sorting my glyphs out!)
I would be really grateful if someone would take a quick look at my toon and maybe give me a couple of pointers on where to start at least with moulding him into an indestructible machine

(or at the very least stop 3 wipes occurring in every instance that I try to tank :p lol )
http://eu.wowarmory.com/character-sheet.xml?r=Jaedenar&cn=Azra%C3%A9lI think the link works but I can’t check it from work

Thanks in advance for your help, sorry this post is so long, and I can’t wait to see your replies.
Az