It's called Data Merge in InDesign. You will need a csv or tab-delimited text file.
Too detailed to sum up in a post, but read some of this, and please come back if you have questions or problems using it.
First you must have a CSV file with headings of each column in the file and the InDesign File open. Apply a text box to the area the Mail Merge will take place. You can do this with a paragraph and you can also anchor objects such as imported images (pics or signatures). Typing the paragraph or placing editable text files is the best way. On the Menu bar at top Window > Utilities > Data Merge. On the Data Merge Pane in the top right corner is a drop down menu. Click and choose Select Data Source > navigate to the CSV file and choose it. It should now be imported into the Data Merge Pane. Select the area you want to import the text from the Data. Click the field that applies to the area you would like that field merged into. You can also preview it. In the Data merge pane there is an option to merge the file in InDesign then export it how you would like PDF,JPG or another of the options in save as type while exporting OR there is the simple option of exporting to PDF.If it is alot of records and 1 static image pertaining to one page these files can take some time to process at the printer. Hope this helps.