There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read this
Since you have just started, you may want to run the Live CD again and perform a clean install. You can use the partition editor from the menu with the Live CD running to make your partitions the way you want them. Then, when you run the installer, the partitions are already established. That would be the easiest way. Good luck.