Give me details as to the condition of the rubbers, sliders, calipers.
If bad you will have to spray the complete brake assembly with rust remover free up everything, dismantle, clean, replace, repair and reassemble. You may not be able to save the pads, but replace them. Depending on the rotor condition they may need a cleaning, a squaring up and then packing the bearings.
The worse the brakes the more work for you including bearings, steering etc.
Let me know how bad