Ditto to the above, due to my lack of time.
Do a search, and limit the search to the wood section of the board.
Basically, Sodium Percarbonate products for cleaning only, and sodium hydroxide based products for stripping. Both need to be followed up by a brightner, such as oxalic acid or citric acid.
Check out the search function........Lots of info to be found. Do some reading, and come back with some follow up questions.