You have an interesting few months ahead if you are as inexperienced as this post seems to imply
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The first step is to set up your tables.
prefix all your tablenames with tbl (tblEmployees). Don't use spaces in your field names, but capitalize words (FirstName, LastName).
All Employees and details relating DIRECTLY to them go in one table ( PayrollID, Name,DateOfBirth,Department). If PayrollID is a unique identifier make this a primary key field.
All Documents and details relating DIRECTLY to them go in another table (tblDocument) DocumentID, Subject, DateCreated etc.
You will then need to create a third table (tblEmployeeDocuments)which links Employees to specific documents. This will have to include the key fields from each of the foregoing tables.
This is the very simplest scenario possible. If your documents have differing Authors for example, you'll need an Authors Table linked to your Document Table.
You can't avoid an intensive cramming session on ACCESS before you start. The basic structure of your db must be right to begin with if you wish to avoid endless revisions and corrections further down the line.
I would strongly advise you to look through the Database wizards for a sample db that comes closest to doing what you want to do, and using that as a template. And buy a good book on Access.