Collection of objects, how best to organize?

Question

Visual Basic

I write on VBA some kind of automation for Excel.
I want to create a collection of objects. I create two classes, one for the collection, the other for the object. I want to add an object to the collection automatically when it is initialized.
Question 1:
Is it nice from the point of view of OOP to call the methods of another class from the methods of one class?
Question 2:
How to implement such a call, using the object itself as a parameter, did not google.
An object must have a method that adds this object to the CollectionClassVariable collection:

Public Sub AddToCollection()
    CollectionClassVariable.Add Me ' Me - это некий референс на объект изнутри его метода. Не знаю, как сделать. 
End Sub