Getting into the habit of exercising, especially tuning up your muscles will have a great impact on your swing. It will help you have a good stance and increase total balance and control on your swings.
Do not swing too hard yet. It is really tempting to give your swing that extra effort. Regular exercise will, in time, allow you to have a faster, more controlled swing.
Keeping updated with the latest about golf will also help.
Also, most players tend to be so conscious in their desire to improve their swing that their minds are focused on every aspect of the swing itself; doing that will only make your swing look awkward.