I'm approaching to Beilinson conjecture and after studiyng some properties of the Deligne-Beilinson cohomology i want to unederstand the regulator maps. But i don't know anything about K-theory and i would understand the necessary information to introduce this argument. There is some reference or some reasonable "chain" of references to follow to understand the construction of regulator? Secondly, i would understand clealry the relation between this regulator and L-functions. Someone can help me? Thanks you!