For a good bond with the wood and the bedding material, you don't want oil to get between them.
Clean the whole stock, and then clean and degrease where the bedding material will go. You want to remove any BLO or other assorted crud that is on your contact areas that could interfere with a good bond. You can degrease with alcohol or acetone, just keep it away from the outer surfaces if you want to keep the original finish intact.
Other than that, your bedding kit should have complete instructions.
Good luck.