Here's a little thing to get you by on manual.
Aperture (or f-stop) basically means how much light you let through you camera, usually aperture really goes hand in hand with shutter speed.
Aperture goes from f/64 (a small opening) to f1.4 (a wide opening).
Shutter speed usually goes from 1/8000 (very fast) to 1 sec (usually considered quite slow)
http://www.shortcourses.com/use/using1-9.html
As you can see, a larger f stop will mean more light will enter your photo and a small aperture means less light enters, If you want a long exposure picture (i.e glow stick photos) then it would be best to use a small aperture and a slow shutter speed, the longer you leave your shutter open also depends on how much light you want to enter your photo.
If you are wondering how you would know what shutter speed and what aperture you are going to need, it's simple, you don't need to know!
If you look through the viewfinder on your camera and half hold down the shutter button a small green metering system will appear.
This is what you will find on your screen, as long as the square is in the middle of these numbers you will know that you have the right aperture and shutter speed for the photo you want.
Also don't forget if you are using a long exposure to use a tri-pod. You can get them cheap enough (around £10) from eBay or you can get the more expensive sturdy ones for about £20 more (I'd only recommend this is you are going to use it all the time). the last thing you want with a long exposure is camera shake, holding your camera by hand is definitely not the way to go with this your photos will come out blurry and all that hard work you put in setting it up will be wasted.
If you need more information this website got me through college when I had a film SLR
In the mean time, here is a link to favourite long exposure Photographer Andrew Whyte
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