Begin with
'Imports System.Runtime.InteropServices'
then use GuidGen to generate three GUIDS and add a section like this inside your class...
#Region "COM GUIDs"
Friend Const ClassId As String = "9029E0FE-5554-496c-885B-12F7E8C7D872"
Friend Const InterfaceId As String = "B7FB59F0-76C6-4c0b-8702-A9BCA943E946"
Friend Const EventsId As String = "2A1A8808-FB6A-4aaa-8F99-B3FBB420D993"
#End Region
Then, on the live above your Public Class Class1, include this tag so that it looks like this...
<ComClass(Class1.ClassId, Class1.EventsId, Class1.InterfaceId)> _
Public Class Class1
Then, go into the properties of project/Configuration Properties and check the box for "Register For COM Interop"
Build your DLL, and distribute it along with your app.

James