Copying Instances From One Workbook To Another

I have two workbooks, a "vehicle workbook" and an "Oil sample" workbook. I'm trying to write a macro that will store the ID of the vehcile in "vehicle workbook" into a varible, open the Oil sample workbook and find instances of the vehicle ID in column B. Next it will copy the entire row, and paste it back into the "vehicle workbook". I've taken some code and modified it to try and make it work but I'm running into problems. I'm very much a newbie to excel and macro's and am learning little by little. This is what I have so far...

Option Explicit
Sub btnFind_Click()
Application. ScreenUpdating = False
Application.EnableEvents = False
Dim vehicleNumber As Variant
Dim sourceLocation As String
Dim sourceFileName As String
Dim fileName As String
Dim vehicleFileName As String
'referencing the workbook location of the vehicle
vehicleFileName = ActiveWorkbook.FullName
MsgBox (vehicleFileName)
'copying the vehicle number into memory ie.EFQRTS67WZ100121
vehicleNumber = ActiveSheet. Range("A13").Value.....................