Hi George! Welcome to the forum. When you get a minute, stop by the intro thread, and tell us about yourself.
In the meantime- OLD? HAH! I got boots older than that!
Your rifle was made between 1960-1971. You can get a repro of the owner's manual from Victor & Cheryl Havlin at havlinsales.com for a few dollars. They are very nice folks, run the Mossberg Collector's Assoc, and a a great source for Mossberg parts.
This is the owner's manual for the 353- but field strip instructions should work for yours. Click HERE: http://stevespages.com/pdf/mossberg_353.pdf
If you have problems, post here, or drop me a private message. Warning- Mossberg 22s are addictive. Started with one, have about 18 of them now. I think they multiply in the dark in the safe.