See the article "Creating a Mail Merge Data Source" at:
http://www.word.mvps.org/FAQs/MailMerge/CreateADataSource.htm
and "How to convert addresses into a Mail Merge Data Source" at:
http://www.word.mvps.org/FAQs/MailMerge/ConvertAdrsToDatafile.htm
and "How to create a Mail Merge" at:
http://www.word.mvps.org/FAQs/MailMerge/CreateAMailMerge.htm

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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP
> Have a data base of approx 300 names, addresses that I need to put on a
> pre-printed letter and make a matching envelope. Must do this once per
> week.