You use "will" when you are speaking of a future intent to do something.
You use "would" with the possibility or desire of that future intent.
Here are some examples:
I will be going to the movies tomorrow. (Future intent)
I would like to go to the movies tomorrow. (desire for that future intent)
I would not do that if I were you. (The IF statement uses "would", and in this case "will" would not be appropriate)
Hope that helps.