These are the pads I use. They are ceramic and don't squeal. They also are much better brakes than the stock pads. Go to
http://www.denniskirk.com and search for the part number 19-799. They cost $27.95.
One issue you might encounter when changing the pads is pushing the piston back in. You may need to do this if the pads are badly worn or you didn't pay attention to the manual instructions and squeezed the brake lever with the caliper off. Its very hard to get the piston to move by hand. There is a tool made for doing this but a C Clamp with padded jaws will do the trick.
If you decide you need to change the fluid be very careful. Brake fluid is a pretty good paint remover. Be sure to use the correct fluid they don't mix. Use only new fluid from a sealed can. Brake fluid likes water and it its been open and exposed to humidity there will be some moisture in it. I would pump enough new fluid through the system to flush out any old stuff. This would also be a real good time to to change any old or worn brake parts like those rubber brake lines. Inspect them closely and if you see cracks or anything else that looks suspicious you might want new ones.