Simon, I also recommend you post some of your captures in the beginners astrophotography section.
Make sure you include the equipment used, settings & exposure lengths, etc as well as how you processed the image... whether you used darks/flats/bias, what program you used, etc, etc...
You will find that there are many on here that have been down your path already & are more than willing to gently critique, guide & educate you on how to get the best out of your gear...
As has already been mentioned, there will be limits to what you can achieve with your setup but, it's up to you to decide whether what you achieve suits your purpose or, to what level you want to take your imaging... you can do this without spending a fortune if your expectations are modest... or, this can get very, very expensive, very, very quickly...
