I'm not quite sure if I'm on the right track or not, but here goes. I have a database that is a job log. I would like to be able to select the customer and have all of that customers information automatically come into the form. Is a lookup what I need? Please help!

You can use the combo box wizard and create an unbound field to select the customer and display the related information.

To expand a bit on Wh00t's explanation create a combo box using the Wizard and on the first screen of the Wizard select the third item, "Find a record....". Finish the rest of the Wizard. Now when you select a Customer from the combo box the form will display the Customer information.