I refinished an old rifle this year. I can tell you what I did but you're on your own. I sanded mine down starting with course and working my way to fine. I then wiped the stock down with a damp rag and let it dry. I used wood bleach to bleach the wood white. I applied about 4 coats of bleach to achieve an even color. Then I stained it for two coats with standard stain dabbing between coats to make sure I achieved a consistent finish. Then I used clear shellac for about 4 coats sanding with 00 and 0000 steel wool between coats.

Hope that helps.

Tom