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Very nice start Simon.
Just a note on the ISOs, ultimately, once you go beyond the point where you are getting one signal level (ADU - analog to digital unit) for per set of electrons/noise, then you are simply making the image appear brighter at the expense of dynamic range (total pixel electron capacity / total pixel noise). Older cameras have more noise than newer ones so older cameras managed only ISO 100 - 400 before images really started to suffer. Modern cameras, particularly the Nikon D5100 and later, the Canon 5D mk2 and later full frames can take really high ISOs 800-3200 and not suffer too badly. Canon 600D/60D and later seem pretty capable around ISO 400-800 in my experience.
Hope this helps,
Cam
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