As far as I understand (I'm newbie too), the hop varieties are more preferences (taste, bitterness, aroma) than specifics. Although, if you're making some specific styles, then you need to use specific varieties to get the taste/aroma/bitterness to match the style requirements. But if you're just brewing for good beer and fun (and not competition to be judged or trying to match a style requirements) then you should be fine.
So if you have some mystery hops, you can still make good beer from it. It may not be perfect, but just look up a recipe for a single hop IPA or something like that. Just my thoughts, like I said, I'm a newbie too.