Generally speaking, values can be divided into three groups: personal values, societal values, and governmental values. Below is a common (but not exhaustive) list of values found in each group.
Your value (sometimes called a value premise or a core value) is the fundamental thing you're arguing in a Lincoln Douglas debate. It's a somewhat abstract and subjective concept.
Every argument that you make in a debate round should relate to this value premise. If you cannot show how your side better achieves your value premise, then you should lose the round. Therefore it is very important to choose a value premise wisely and never forget that your arguments should focus on it at all times.