There are many types of finish. Your local library should have books on furniture/woodworking, etc..
Linseed Oil
http://www.outdoorlife.com/outdoor/diy/article/0,19912,658527,00.html
Can't be answered without knowing who made it and the serial number. don't refinish it.
the stock is what you use to hold the weapon by.
the tf11 only comes with a stock or it doesnt. you can not buy an extra stock for the gun.
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use a saw and chop the stock, then refinish and attach buttplate.
About half or 2/3rds. But some people like their guns to look good, so if you plan to keep it... shoot it, refinish doesn't affect operation.
yes just sand it and cover it with clear coat
Try gun shops, gun shows, want ads, e-gunparts.com
Mainly in the stock
Estate sale, garage sale, gun shop, pawn shop, gun show, stock shop