Hi, and welcome!
First, clear the cache. That can free up a lot if you have never done it. Go in to settings-->manage apps and when you click on each app there is the option to clear data and cache. Clearing out data can also free up a lot of space, but be careful, as you will lose all your information--login info, game scores, anything that is your own.
Second, and while you are checking each app, look to see if it can be moved to the sd card. If it can move, move it (except don't move widgets, or they get all wonky.)
Third, check to see that you really use all the apps and delete ones you don't really want. You can always reinstall them later.
You might also want to join forums and check out the folders for your phone. Then you can get help from other users of your specific device.
Hope this helps!