Once you create a quote from your deal you can go to the quote section then find your quote in the list, from there you can check to verify accuracy.
In the main quotes page you will find all quotes that have drafted, sent, won and lost. The main list will show you each quote, the stage and expected earnings. You can filter at the top of the list by stage
You do have the ability to edit quotes, but all quotes must be created through the deals module..