Hi there, I'm afraid isankey dont know the druid class to well atm, so I'm going to help you out a bit, as I still have to helpout allot of resto's as I review guild apps.
There is however a few good things you can take from isankey's reply, like making some craftable items and collecting gear etc.
Why am I saying he is wrong on things and you should read what I'm writing?
Well I really dont want to 'brag' or talk about myself, but I am in a more serious raiding guild. I review new druid apps for the guild & they pay my wow subs when I raid.
I have been on a 3 month raiding break from WOW due to RL, but before I left I did all the U10 Hard modes (rusted proto drake), almost all the 25 man HM's (would have it now also if not for RL

), Have killed Algalon etc. Missed the 'new' TOC things thou for reasons stated already.
I'm just going to go on as things come into my head, so here goes.
About gearing, Spell Power is your no1 stat as a resto druid, then haste and these days when u look @ the T9 gear crit also (but it will change again to some extent in the next patch)
Later on as you gear yourself mana regen should NOT be a problem as a resto druid, so you should NOT stack spirit (spirit druids = bad druids) as you will get more than enough from Gear. Don't forget gear with +mp5 on and no spirit is most of the time beter than spirit gear.
So always enchant SP on items where you can and gem SP. If an item with a blue stocket for instance gives you +4 crit, ignore the socket bonus and still gem a SP only gem.
Only gem to get the socket bonus if you need it for your META gem (head - Ember Skyflare Diamond is best) or if the socket bonus will give you +7 sp.
Btw, I'm mostly speaking looking @ raiding when you have better gear, so as you gear u might need a bit more regen etc etc.
Your aim later when looking @ gear when raiding and collecting more is to get Haste gear untill you atleast have 359 Haste rating, as that is your haste soft cap. It will give you a 1 sec GCD (globel cool down) that u want. More haste is oc alway a bonus
Regarding healing itself, this is where people see the difference as any1 can have nice gear these days. Its all about skill and know what to do when and how to do it effectively.
Healing heroics and raiding (25 man for me mostly) is totally different thou.
I still do some HC's but with my gear level and the tanks we got not much healing is needed really, so I mainly just do rejuv & wg BUT for you its different and I still remember how I healed HC's @ 1st, but it was a long time ago and its a bit differnt now
In a HC you are ofcourse the Tank healer.
So hc's: I usually pre-hot the tank with Rejuv & then start casting Regrowth as he starts tanking the boss (you might wanna pre-hot him with that also if needed). Then you can do LB stacks on him if healing is needed, probly 2 stacks and let it bloom nowadays, or you can just keep it up if your mana is ok in 5 mans, BUT now when raiding.
(in my day LB was not nearly so expensive and we just kept 3 stacks up @ all time. these days its to expensive mostly and u need to let it bloom mostly)
Never, ever heal the raid with LB!
Fill in the gaps or big hits you gets with Swiftmend etc & Nourish (a reason to glyph it)
Group healing most of the time can be sorted with Rejuv & Wild growth, but you can just as well just do a quick Nourish on them, probly needed when you have lower sp.
Mostly thou, you do what the situation requires in HC's
In a proper raid (25 man) you will 99% NOT be the tank healer & this is where Duids shine and its very different from HCs'
You will have 2 main spells and this is the best Druid spells by far! Rejuvenation & Wild Growth! (get the glyph! 1 extra target is great in raids)
You will be a raid healer and you will cast Rejuv on every raid member that needs healing, You can have like 15 ppl with rejuv ticking on them @ any one time.
Use WG whenever multiple healing is required and as often as possible, its an awesome spell.
Use your SwiftMend on targets that gets big hits, or the tanks when they get low. Its only a 15 sec CD, so I use this allot!
And ofcourse you use Nature's Swiftness + Healing Touch in emergensies as it has a long CD
One really dont use Nourish all that much, just when real spamming is needed sometimes, like certain constant big dmg spells on some1, like Napalm wen you fighting Mimi 25 Hard mode in Ulduar.
Ofcouse sometimes the Raid leader will ask you to also Hot the tank whenever you can, just to help a little. That means Rejuv and/or Regrowth if u have a sec to do that. That also means u can quickly SM then when needed. You can drop some LB's on there also if your mana is always good.
The thing when raiding, specially with a orginised guild is that each person has their job, and every1 tusts the other person to do it right, thus for the most time I will not step into their healing space and just cause overheal.
For more info and Theorocrafting have a look @
http://elitistjerks.com/f73/
isankey's talent build is fine, but not the glyphs, Major Glyphs to use
Glyph of Wild Growth (with raiding mind 10man+)
Glyph of Swiftmend
Glyph of Nourish (helps these days more with the crit idea blizz wants)
Regarding addons, I used to use Healbot & some of our other healers use Grid etc. but lately I've moved over to Vuhdo also. Very nice addon imo!
Its early morning and thats all I can think off now, Feel free to Skype me if you want to chat a bit more.