You are in a classrom aren't you?
I ask this because I can see that your tutor is wanting you do to something like the sample below.
You will want to use and leant the Type keyword in which you may create your own Type of variable. Another name you might see around is UDT (User Defined Type).
This simple example should see you pointed in the right direction. All the padding (thats what it's called when you want text fields to contain trailling spaces up to a preset limit) and truncating is handled for you automatically by the UDT.
Code:
' this is on a form with a Command Button
Option Explicit
' declare your UDT
Private Type MyType
SSN As String * 13
Address As String * 25
End Type
Private Sub Command1_Click()
'declare a variable
Dim myThing As MyType
' use the with keyword for ease of reading and speed
With myThing
' set one "field" of the UDT
.Address = "this is only part of it"
' set another field
.SSN = "1234"
End With
' print the content of the fields plus the length of them
Debug.Print myThing.Address, Len(myThing.Address)
Debug.Print myThing.SSN, Len(myThing.SSN)
End Sub