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dpreview is a good place to learn... they have a ton of info there to help you out...
your lens is a 18-55 f4-5.6 which means:
you can use F4 and up on the 18mm end and only F5.6 and up on the 55mm end.
quick run down of F Stop numbers...
the LOWER the Aperture Value (f Number) you use, the SHALLOWER the depth of field gets. the LOWER number means the 'eye' of the lens is open much WIDER which in turns allows MORE light into the camera which causes u to SPEED UP the shutter in order to get a proper exposed photo an not one that is all WASHED OUT BY TOO MUCH LIGHT
the HIGHER the Aperture Value (f Number) you use, the DEEPER the depth of field gets. the HIGHER number means the 'eye' of the lens is open much SMALLER which in turns allows LESS light into the camera which causes u to SLOW DWON the shutter in order to get a proper exposed photo an not one that is all DARK AND UNDEREXPOSED.
you will notice that lenses with low F Numbers like F2.8 F2.0 and F1.4 will be alot more expensive... simply because they can allow more light into the camera...
it may not make sense to u right off the bat but after u read it a couple of times and take some practice shots it will all make sense...
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