I'm also in CA.
I try to make my invoices easy to read for the customer, and don't confuse them with set up fees, shirt cost, print fees, etc. I just simply have the Qty, a description, a piece price, and a total price that has all these prices factored in.
Then I subtotal and add a tax line beneath that. So I guess I am taxing everything.
I remember reading from the BOE handbook that labor charges are taxable, but you should read up on this. BOE has a lot of useful handouts that state specifically what is and isn't taxable.