To be honest "broadcast quality standards" is a relative term. Some things on broadcast look great, some look terrible. You are somewhat limited by shooting on a DSLR as they all shoot highly compressed footage that doesn't room for much color correction. Regardless, if you light well you can still get really solid footage.
I'm not sure what lens you have now but if it is a kit lens, I would definitely recommend getting a 24-70 f/2.8. Good glass is just as important as a good camera (if not more).