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Thanks Ronson and David,
To answer both your questions, I usually only take about 20 or so exposures (rarely more than 30 seconds each). Most of the time I also take some biases, darks and sometimes flats but that's about it.
My post processing basically consists of stacking the images and subtracting the darks/flats/biases if I've taken them, then playing around with light curves in GIMP.
To your point David, yes I do live in a light polluted area so that's definitely a factor to consider.
I've attached an example which I was happy with (Orion nebula) but with others like the Rosette nebula, if you can just imagine a bunch of whitish, bluish & reddish stars on a black background, that's pretty much what they all look like. No gases or other colours showing up.
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