I'm a bit of a RAF expert after doing it so many times so let me try answer each question for you:
1) Iset up an email that's different from my current account
You can choose to use your current battle.net account and have both under the same email address (this is awesome for trading heirlooms back and forth etc) or you can make it on a seperate account (if it's for someone else to use or you just want to keep it seperate)
2) I send a RAF email invite from my main account
You log into the game and under the friends tab you click the RAF button and send it to the email you want.
3) I accept the invite (friend acc.) And activatethe new account
4) I buy the starter digital edition from the blizz store (up to cata)- for 20$ on the friend acc.
5) I put in the 60 day game timecode
So a couple of questions:
a- do I need 4 different emails for 4 recruited friend accounts?
You can have them all on the same bnet if you want as mentioned at the start (a maximum of 10 accounts on one bnet)
B- do i need a different PayPal or credit card for each account set up or is the game time card enough
No it can all be on the same
C- do I get 4 months game timeadded to my main account?
in theory yes. the first month gives your main a month, so you can think of it as buying the time for your main account for the first month.
D- if my main aaccount gets 4 free months do I alert Blizz. To stop my auto payment or is that done automatically
If you want to cancel your subscription log into your account management to do so, they will not cancel it unless you do so yourself
E- is there anything I'm missing?
It can take 72 hours for your trial account to be converted to a 'main account' meaning it can't talk in trade chat, it can't trade with any characters (so you can't send it gold etc) but it generally is done within 24 hours
Enjoy the RAF perks, if you can be bothered to level some alts it is reeeaally worth while doing it, I can't stand levelling without it now
Thanks for your help! Just trying to improve my collection before the RAF offer disappears (I presume it won't be eternal)