how to say " I see" and "how are you" in German

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I think if ' I see' is refer to expression of understanding it's quite to 'Ach so'.  And 'How are you' can be ,' Wie geht's?', ' Wie geht es?', or 'Wie geht es dir?'

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ich sehe, wie gehts

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I see = Ich verstehe oder Ach so.
How are you?  = Wie geht's? Wie geht es dir?

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If you mean 'I see' as in like 'Oh, okay, I get it' then it is as Fatiya says: 'Ach so'
If you really mean that you're seeing something: Ich sehe.
'How are you' Normally: Wie geht es?''or 'Wie geht es dir?'
And 'How are you' Formal: Wie geht es Ihnen?

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You need to be more specific. There are quite a few ways to interpret "I see" in German. 
Haw are you? = Wie geht es?

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