The best thing you can do is take the CCIM Intro Class. It will count for your license CE and will give you an overview of commercial real estate with the focus on Investment Properties.
Before entering you should decide what area of commercial you want to specialize in ie..Investment Properties, Retail Leasing, Multi-family commercial, industrial, vacant land for development and the list goes on.
Some agents do both commercial and residential but I personally feel if you want to be a commercial agent you should do only commercial property and refer out any residential property to a residential agent and hopefully they will do the same for you.
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Paul Oaks
Oaks Real Estate Group