Where can I get a FREE manual and find out how much my "White" sewing machine model #3355 is worth?

My sewing machine was given to me through family, and it does work and is in a wooden cabinet. It has a side bar that you control with your leg to use like a "footpetal". I recently had some problem with the needle hitting the side as it went below to pick up the bobbin string, and I have all the pieces, and cams, and I don't know how to use them, and what all this machine can do. I have thought about selling it, and also wondered how much it would be worth. It's in great condition.

you can try looking on ebay... generally they are not really worth all that much money anymore with all the newer ;machines being embrod. ones and all,,, but I always found ebay a great place to start...good luck