To get you started, you can enter in "brakes" in the search function and then search the 92-99 mechanical section.
Also, here is a link to autozone that basically replicates the Chilton'* Manual for brake repairs.
Depending on the year of your car, you need either a T-55 Torx or a 3/8 inch hex (allen) socket on a ratchet or breaker bar to remove the calipers.
To help you better in the future please add your year and model (SE, SSE, SSEI) of Bonneville to your sig. Hope this gets you started...I am sure others will jump in soon with additional information.