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I think you can search up clan tags in the in game clan section. But to do that, you can't currently be in a clan. 

The extra premium account you won will be added on to your existing time. So if you had 15 days left and won 3 more days, it'll expire in 18 days.

Easiest way to earn xp in my opinion is to use Isida. It is best used with Viking or Hunter.