Raggie- Here is an easy way to remember.
1.Take your film ASA speed and put this same number into your shutter speed. So, if your film ASA is 200 then turn your shutter speed to 200.
2. Now adjust your aperture to the light....
Snow or bright sand is f16 or f22
Sunny day would be f11 to f16
Less sunny day would be f8
Cloudy day would be f5.6 to f8
Darkening outside or bright inside would be f4
Inside bright f3.5
Inside slightly dark f2.8
Really dark would be f1.4, f1.8, or f2
If you need to change your shutter speed, just remember that when the shutter goes UP one stop, the aperture goes DOWN one stop. If the shutter goes UP two stops, the aperture goes DOWN two stops etc etc. And vice-versa.
So if you have f8 at shutter 1/200 and you need to go up to shutter 1/250 then....Turn the shutter up to 1/250 and the aperture down to f5.6.
Hope I haven't confused you.