In Buffy, the slayer has to have super human strength in order to fight vampires. We know that the vampires don't have fighting skills before they are turned.
In the episode Gingerbread, Joyce sees a vampire and says

> 
> It's Mr. Sanderson from the bank! -[buffyworld script](http://www.buffyworld.com/buffy/scripts/045_scri.html)
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> 
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Dawn even makes a comment about their fighting skills in the episode Lessons when she's about to fight a vampire coming out of it's grave

> 
> But, he's new. He
>  doesn't know his strength. He-he might not know those fancy martial
>  art skills they inevitably seem to pick up. -[Buffy Guide Quotes](http://www.buffyguide.com/episodes/lessons/lessonsquotes.shtml)
> 
> 
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Where do the vampires learn how to fight?