I agree with Charles, a mail merge is what you want to do
Beginning a Mail Merge
http://wordribbon.tips.net/T005965_Beginning_a_Mail_Merge.html
Performing a mail merge can be intimidating to some people. It needn’t be; Word provides step-by-step wizards that lead you through the process. How you use these wizards is dependent on the version of Word you are using, however.
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**Creating a Mail Merge Data File**
http://word.tips.net/T001369_Creating_a_Mail_Merge_Data_File.html
An easy way to perform a mail merge starts with creating a data file in a Word document. This tip shows how you can create the data in a document in a tabular format that can be easily understood by the mail merge feature.
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**Creating a Mail Merge Data Source**
http://word.mvps.org/FAQs/MailMerge/CreateADataSource.htm
Microsoft Word supports many file formats which can be used as a Data Source for a mail merge. This article covers specifications and frequently asked questions on the most commonly used Data Sources, along with how to set up a Data Source in Word.
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Design and set up a mail merge address list in Word
https://support.microsoft.com/en-us/help/294688/how-to-design-and-set-up-a-mail-merge-address-list-in-word
This article describes the acceptable formats for a mail-merge address list and includes suggestions and questions that are helpful to ask yourself as you create an address list.
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This is the first article in a good series, but parts of it are not available on the web so you have to know where to look
Essentials of Creating a Mail Merge with Word 2007 (in 9 parts)
Series: By Dan Gookin
http://www.dummies.com/how-to/content/the-essentials-of-creating-a-mail-merge-with-word-.html
Merging your mailing lists with documents you want to send via e-mail is easier with essential steps clearly described. The mail merge tool in Word 2007 can streamline the process of getting the word out to many recipients — without manually personalizing a
multitude of e-mails
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Step 1:
Creating the Main Document
https://web.archive.org/web/20151024144338/http://www.dummies.com/how-to/content/word-2007-mail-merge-step-1-creating-the-main-docu.seriesId-231323.html
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Step 2: Assigning Fieldshttps://web.archive.org/web/20160405111748/http://www.dummies.com:80/how-to/content/word-2007-mail-merge-step-2-assigning-fields.seriesId-231323.html
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Building Recordshttps://web.archive.org/web/20160105014626/http://www.dummies.com:80/how-to/content/word-2007-mail-merge-step-5-the-final-merge.seriesId-231323.html
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Inserting Fields Into The Main Documenthttp://www.dummies.com/how-to/content/word-2007-mail-merge-step-4-inserting-fields-into-.seriesId-231323.html
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The Final Mergehttps://web.archive.org/web/20160105014626/http://www.dummies.com:80/how-to/content/word-2007-mail-merge-step-5-the-final-merge.seriesId-231323.html
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How To Create Labels With Mail Merge In Word 2007https://web.archive.org/web/20160707154630/http://www.dummies.com:80/how-to/content/how-to-create-labels-with-mail-merge-in-word-2007.seriesId-231323.html
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How To Add Graphics To Labels In Word 2007https://web.archive.org/web/20160614153843/http://www.dummies.com:80/how-to/content/how-to-add-graphics-to-labels-in-word-2007.seriesId-231323.html
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Part 9
How To Print Envelopes In Word 2007https://web.archive.org/web/20160707151042/http://www.dummies.com/how-to/content/how-to-print-envelopes-in-word-2007.seriesId-231323.html
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Finally, there is this article about being careful when using test data.
Checking a Word mail merge for bad names or test strings 2018 04 18****https://office-watch.com/2018/check-word-mail-merge-bad-names-test-strings/
In the UK there’s been a lot of laughs and some red faces about a money raising letter ‘signed’ by the Conservative Prime Minister to a ” Mr Youmustbe F*ckingjoking ” and sent to a pensioner. It’s easy to laugh but anyone who has done large mailings knows that it’s a case of “There but for the grace of God …”. It’s the
sort of thing that any professional mail manager should check for. We’ll show you a simple way to check in Word for mail and email merges.
WT MR Mail Merge Magic - Envelopes.doc