Where is the line stand between cheating on my wife versus trying to get to know a second woman to potentially make her my second wife. If I am married with kids and I want a second wife, how can I meet another woman without it being considered cheating on my current wife.

The second marriage is not deception, it is legitimate. However, my advice to you is to study the case and weigh it carefully before taking an action, so if you are comfortable in your family life, and you know that this step will lead to the collapse of stable life, then, it is unnecessary, and not recommended to do it.