There is no such thing as a "stupid question." As far as I can tell, I was not born with knowledge of Access and (practically) the only way I have learned anything is by asking questions on this forum.
So, if you knew everything about Access, you would not be on this forum. Thus, there are no stupid questions; just stuff you don't know, okay?
Here's something else to think about (after you have pondered Rolliee's sage advice):
Fill Fields automatically on form based on a control's value
Author(s)
Erika Yoxall
(Q) Is it possible to have some fields filled in automatically as soon as a certain value has been entered into another field?
(A) A typical example of this is getting state and city name from Zipcodes. If you have a Zip-Code table, you'll never have to enter the State/City again. Add this simple code in the OnExit() event-handler for the field containing the Zipcode.
'************* Code Start **************
' This code was originally written by Erika Yoxall.
' It is not to be altered or distributed,
' except as part of an application.
' You are free to use it in any application,
' provided the copyright notice is left unchanged.
'
' Code Courtesy of
' Erika Yoxall
'
Sub Zip_OnExit(Cancel As Integer)
Dim varState, varCity As Variant
varState = DLookup("State", "tblZipCode", "ZipCode =[Zip] "

varCity = DLookup("City", "tblZipCode", "ZipCode =[Zip] "

If (Not IsNull(varState)) Then Me![State] = varState
If (Not IsNull(varCity)) Then Me![City] = varCity
End Sub
'************* Code End **************
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A Mouthful of Air