How can I create an application with many forms?

Question

Hey,

I have just started to learn C# and I think it's not so hard if u switch from any other programming language.
But I don't understand how I can create a normal application with many forms.
For example u have some menu items like: customers, products, orders, ...
and a main form with the menu on it.
So is it possible to create one main form and include the content from the pages inside a panel?
Or do I have to create multiple forms and by click on a menu item I have to show the the window e.g. customer and hide the main form?
But then I have to create the menu on each form so that the layout looks like the layout on the main form.
I hope somebody understand what I mean and can help me.
Thanks