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Could anyone recommend any good online articles or websites
You're on the best resource. Take a look around. Do some site searches for "Adwords" or dig around here in the Adwords forum [webmasterworld.com].
If you don't find your answers in the Adwords forum, and you have a specific question, then by all means ask them here.
Of course, one great place to dig around in is the Google Adwords web site itself. They have a ton of valuable information just waiting to be digested by your brain.
Less than 30 days later, I'm nearing 2.0% average CTR. One particular ad/keyword set is averaging about 7%. Wish I could get some of the others that high. :)
There are a lot of tips floating around, but I don't think there really is any magic bullet for this. But AdWords gives you a great opportunity to get EXTREMELY fast turnover for trial and error, so use it. Find what works for you, and ditch anything that doesn't. Don't be afraid to try LOTS of combinations.
The major issue will be ROI :-)
What is supposed to be a good conversion rate from clicks to sales?
I realise it depends on many factors but is there a rough industry standard?