First, why do you want to study economics? I know you say it fits with what you did before, but on my experience, this may not keep you motivated during your studies. If you are more interested in business, I would suggest to find a program on entrepreneurship and work your way from there.
Otherwise, I would try the following:
1) Go to the Nobel Prize website, and check the last 10 Nobels on Economics. See what are the subjects involved (do not get discuraged if you don't understand much, it is just to get an idea of what is current on the field).
2) Check some of the latest issues of business/economics magazines.
3) Try to get strong fundamentals. On my experience, (I am an electrical engineer), mathematics provide tools that are of wide use, independent of your speciallity. In the case of economics, I would say analysis (calculus), probabilities and statistics, are the pilars of the mathematical side of economics.
4) I you haven't yet, read "Freakonomics" by Steven D. Levitt and Stephen J. Dubner; it presents an original approach to economics.
Pat
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