what is lifecycle of MSCRM?

Hello All Experts,

Where does it starts from and where does it gets end.

I have come to know with below points, correct me if i am wrong.

it starts from generation Lead

then moving to opportunity

from opportunity make Quotation and create an order against that Quotation 

and from the Order create an invoice .

Lead->Opportunity->Quotation->Order->Invoice.

after this Service Module will come into the picture.

For Cases-> Resolution of the cases.