Hi Dale,
Sorry there is no formal guide as to how exactly you can use twitter to promote your products, although we do ever so often encourage it.
You can start by tweeting business related things 10-20 times a day – you can tweet about your products, promotions, sales and also include interesting tweets from other people or online sites that are relevant to your business. At time you might also consider tweeting interesting business-related things you’ve found on the web.
To build your list of followers, you might also consider following others on twitter, oftentimes they will follow you back and you might captivate some of their followers to follow you too!
For more helpful tips, please check out the links below -
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Hope this helps you optimize your twitter account :)
All the best!