What types of forms would you use for when doing desktop publishing/gd work?

Hello. I was wondering what types of forms would you use to fill out while working with a client who needs graphic design work done? Other than contracts, would you need a production summary or something? I am not sure because I have so many forms I got from this book about dtp design. The forms are: Client Info Sheet (to keep for myself), Quote Sheet (make copy 2 client), Estimate Sheet (make copy 2 client), Production Schedule, Project Summary. Are these forms necessary or are they mandatory? I would love to hear opinions on this.