Heres my question; I've looked around, but how do I become a premium member for Elite?
You can't. Elite Premiums are no longer available.
I know costs are $49,99 a year, but I don't know where to buy it.
They were available for purchase at such places like Gamestop or Walmart and virtual stores like Xbox Marketplace or PS Store.
I've recently started a clan for MW3 and to earn clan exp/badges I need a premium member in it, which will be myself.
With Elite issues related to Clan management I doubt you'll even be able to recruit a Premium member to join you.
I regret to inform you that the Premium Elite service is no longer being offered. Existing premium members cannot renew as the service is entirely free. Please note that clan events for Black Ops 2 are all free to enjoy for both Free and Premium Elite gamers.
Activision Support ^AxelSpoons