if its squeaking it could be to do with the suspension joints or the the suspension bushes, you will hear this mostly when accelerating, braking or going round corners. if its squealing all the time it could be your cam belt or the brake pad squealers, they squeal when they are too worn out and need replacing.
The car may need new brakes or tires because they might be wearing down.
The little mouse under the pedal
Loose alignment is the most likely culprit. It could also be the servo if your car has got one.
Generally new pads will contain a layer of dust which causes the initial squealing. The squeal should go away after a bit if driving.
Usually the accessory drive belt is faulty
Squeak or whine? Possible that your clutch is going out.
Squeak in tires (when turning in particular) could mean low tire pressure, or bald tires.
That could be the brake pad "squealers". They are designed to squeal when they are worn out. Time for a brake job.
The release bearing on the clutch is at fault. Throwout Bearing, replace the Throwout bearing and check the Fork for Damage.
If your car has a manual speedo, it can be in it or the cable. Noises have to be heard to be correctly diagnoised.
You probably need a Lube job. This should be done on alternate oil changes as a routine measure.
Check your power steering fluid or your fan belt could be making noise.