Lead, Contact, Potential, and after that?

Lead, Contact, Potential, and after that?

Let me see if I understand this right...

I have the Lead, I qualify it then becomes Contact, I finish up the details and then becomes Potential.

So now in this potential I add the products I'm sending to him. How can I put a quantity of each product? How can I make them remove from the inventory?

What should I do next?

I want the info for the 30 closed potentials and what I have to deliver to them.

Thanks!
Gery