Specific question about RAF.

Hey guys, I know I havn't been very active on these forums. I used to dual box and was getting quite into dual-boxing (using keyclone) but the problem was when the markets did a loop-di-loop. I live in South Africa so we got effected badly with the exchange rate so had to cancel my second account (not very rich).
Thats pretty much why I stopped posting etc here but still visited dual-boxing.com now and then.

Anyways, my friends and my self lately have been running alot of Pre-BC and BC raids. everything from ZG to MC to AQ40, from kara to SSC to Sunwell.
We almost have full tier sets of everything now, and I almost have my self Sulfuras, Hand of Ragnaros and 1 TF binding (legendaries from Molten Core).

Lately we have become almost obssessed with them and we are now busy rerolling alts and power leveling to 60 (taking turns using mains to run each other through dungeons etc), buying our selves best enchants and gear and so on). One thing I am considering if using RAF with one of my close friends to level to 60. What I'm planning to do is he will Refer a Friend me, and I will activate that trial account referal with a Normal World of Warcraft CD-KEY (not BC or WOTLK).
Then we will RAF and I will use my main to boost us for gear and so on, then once I hit level 60 and can't RAF anymore (or level anymore because of no expansion), I will transfer my newly RAFed Character to my main account and cancle the fresh account that I bought.

I was wondering how much this would cost.
I know its about 20$ for Normal US WoW (works out to about R200 in my currency).

If we were to level to 20, then activate the trial account with the wow CD key due to lvl 20 limitations of a trial account, and then proceed to level to 60 within say 3 days.
Do I need to still pay for like 1 month's subscription first off?
I mean, in order to activate the US CD key so I need to pay for a subscription? Or if we were able to, would it be possible for us to level from 1-60 within the 10 days (10 days free trial) and not pay for anything else but buying the actual CD key?

Hope that made sense.
Would love some answers and feedback since I know there are people here with endless knowledge about RAF.

Thanks again :)

As far as i know the vanilla wow comes with 30 day subscription - so when you enter that key you have one month until you start getting billed.

When you buy the full retail cd key to remove the trial restrictions on the account you also get 1 month play time. So depending on how fast you can level you may be able to level more than one alt up on the account and then transfer them to your main before that time runs out.

Yeah, I had a feeling about that, but the question is...WILL I get billed? Like as in, do I need to add game time or a subscription in order to upgrade or something?
Like say we are capable of leveling from 1-60 in like 3 days. If we were to level from 1-60 within that time limit of 10 days + 30 days without needing to go over the time limit (I.E account getting closed because of no game time)..would we still need to add game time in order to play the first bit?

Like if you were to upgrade from Trial to normal account, would they say you need to buy a minimum of one months game time to play however you will only be billed for it or it will only come into effect after your 10 days trial + 30 days free is finished.

Edit: Ok cool, (I was typing this as Cruelty replied so only say his reply after I posted this post)