It depends on the situation: 'I am talking with you' implies that we are having a conversation in which we are both taking part. 'I am talking to you' implies that I am talking and you are listening, it is one-sided. For example, a teacher will talk to his students. 'I am talking for you' means I am talking in your place, saying what you want to say. For example, a spokesperson will talk for a company; a lawyer will talk for a client. Hope this helps :)

In general, we say 'talk to ...'. So (as in your example), "I am talking to you." 'Talk with ...' is also possible, but it is less common and it sounds more general, and less direct. For example, you could say, "I was talking with my sister yesterday". But you could also use 'to' here, perfectly correctly. In short, if you are not sure, use 'to'. It is always correct. 'Talk for ...' is not correct.

I'm talking to you. 对你 I'm taking with you. 和你 We don't say "for you".