Hey buddy and welcome to the site!
I've personally levelled a Dranny Shammy to 70 so might be able to help a bit

They are in my opinion one of the most fun, versatile and rewarding classes to level with. But don't listen to my thoughts, or those of the nay sayers, decide for yourself.
Lets have a look at your questions....
1 - Builds, is there a particularly good talent build i could use, im not sure on where to put my points.Well personally I would go for Enhancement to level. Try something like this as you go, completing the Enhancement tree first:
http://www.wowhead.com/?talent=hZxVbdVhsAuqoxbgzThe important thing here is get these key talents as quickly as possible:
- Improved Ghost Wolf
- Dual Wield
- Stormstrike
- Improved Dual Wield
- Shamanistic Rage
When choosing weapons for Dual Wield, try to get those that are as slow and have the highest max damange (not dps) possible.
Always put Windfury on both weapons and use Stormstrike on cooldown and Earth shock whenever Shamanistic Focus procs.
2 - Getting teamed up on. Im fine at taking down 1 adverssary, even a couple of levels above me but sometimes i struggle if i get mobbed up on. Against 1 chracter i can fire a couple of lightning bolts and then melee em to death, aided by a totem or 2 if i have to. But i can struggle against 2 or more. Is there any good techniques to help me?The tactics here can vary hugely depending on what you're fighting. Dropping a Stone Claw totem can keep one mob busy for a while whilst you nuke his friend. Instant Ghost Wolf is incredible for an escape if it all goes wrong. Just drop a Stone Claw or Earth Bind Totem, Ghost Wolf and run.
3 - Any tips in general that will help, i hear tey struggle in PvP. . . how i can i overcome this early on. I think they will be good in groups cos the totems can help the whole team and i can also dish out a bit of damage but soloing seems to be hard. . . . . .I've personally never had a massive problem in PvP although I suspect it will be a bit of a struggle whilst using a a levelling build. Enhancement is hard work and requires good movement, Resto makes you almost unkillable if played correctly and Elemental has devastating burst damage on an unsuspecting enemy.
Totems are a god send in both solo, PvP and Raiding.
It's a good time to be rolling a Shaman, they are getting much love in Lich King.
Hope some of this is useful mate.