Created a new class, how can I make use of Dispose feature?

I just created a new class and everything seems to work perfectly in it, I want to make sure I don't keep any resources on hold after this class is declared and used, how can I implement some Dispose feature to make sure anything used in this class has been disposed?
 
Right now I only declare "Private test as String", then I created a "Sub Dispose() test = Nothing End Sub" which I call at the end, but I don't know if this is the right way to do it as there are functions within this class and I don't know how to check if they were disposed or not.
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