Hi Dave,
Welcome to the forum & hobby
If you are going to keep the notes for yourself, I would recommend not getting them certified, as you do not need to incur this expense.
If are you interested in getting a rough idea of the grade, there are a few options;
1) Attend a local coin club meeting and chat with the paper money expert
2) Attend a local coin show, talk to some dealers and collectors that specialize in bank notes.
3) Take some photos of the notes and send them to a forum member or post them on the forum
4) If you live close to a forum member, they would most likely be happy to meet and tell you what you have, and then talk for hours on how great the hobby is
For storing your notes, it would be recommended that you get some Mylar currency holders to store them in. Do not try to improve the grade of the notes, (eg. erasing pencil, pressing out creases, etc.) as this will hurt the value.