Implement quotes

After several changes and problems solved, we are successfully using the invoice system.
Now we would like to implement the system of creation of quotes.
Given that our business does not provide standard quotes, but the services that we offer are always different and customized with specific descriptions, the voices “item” and “quantity” are not useful for us. Since we don’t need these elements, in the template of the quote that we’ll print can we eliminate both “items”, “quantity” and “price”?
I take this opportunity also to ask another question.
Wanting to customize even the template of invoices with fonts and graphics elements, can you give me some guidance to do it?