How much is it to sue for defamation

Civil litigation is costly, so what are the factors to take into account when you make a decision to sue or not to sue?
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[@user-vu8le1lk5o]

I was arrested. The accuser lied about me pointing a gun at him when he had previously stole my gun from my apartment.

[@user-vu8le1lk5o]

What happens if there's a false accusations and its a lie and there's no proof of the false accusation, only the lier word?

[@user-vu8le1lk5o]

Can the judge knows that the accuser is lying and is doing maliciously?