Question about table compression

I administer several 10g databases, and have been asked to compress tables in several tablespaces. I am unfamiliar with using compression. I have read some Oracle documentation on the ALTER TABLE... MOVE COMPRESSION command, but still have several questions. Can anyone recommend a good white paper, or other documentation on how best to compress tables with existing data? Thank you in advance for your guidance!

Basically, I have questions about how to select which tables will benefit from compression. I also read somewhere that, once a table has been compressed, new updates to the compressed data will not be compressed and so I will need to re-compress the tables periodically.
I also needed to know if the ALTER TABLE statement will compress the existing data or just future inserted data. Through further research I found that by using the MOVE clause, it will compress the existing data. I will also need to rebuild the indexes once the ALTER TABLE statement is complete.
Thank you for your help and encouragement!

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Thanks SriniChavali and Stefan. I can't make more answer "Helpful' so I couldn't do that for your answers! Here is my point. In Jonathan's blog i see this remarks:
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Hi,
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Kindly Reward the points if helpful !

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Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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