What to do right as a new programmer

globeadue writes: "My company just tagged me for full time App Dey — I've essentially never coded for money, but the last 3 years of support desk gives me the business sense to know the environment I'll be coding for. Now my company will be training me, so I think the technical side of things will be covered, what I'm looking for is best practices, habits I should/shouldn't develop, etc as I take on my new craft. I'm sure this has been asked before, if so, pointing me towards such would be much appreciated. Thanks in advance, James"