I’ll go along with another here, the problem seems to be prolonged periods of minimal maintenance. If you are going to try to wring many, many miles out of this car you really need to become more familiar with how things work and where they are.
None of us can help you look over your car to see what’s going on. Sometimes the best idea is to take a few hours and just look at things in, on and under the car, take photos, wiggle stuff, look for places where rust is destroying the car or where rodents are eating it. Look for oil and coolant leaks. Look for stuff that’s loose. The Owners manual is available for download online from Mazda:
2000 protege Owner’s Manual