Just flush your money down the toilet by putting up a lame site that accomplishes nothing, tell your son about it, and then go back to business as usual. However, if your intention is to get some return on investment, then keep reading. Now let's ask and answer some important questions. Of course this will depend on a number of subjective factors. YES, you can have as many as you like.
Many major corporations use numerous domain names to attract visitors.
That depends on the nature of your business. You might want and need hundreds of domain names, such as a little company known as Disney has, or you might only want one or two. To make the proper decision requires analysis of your business purposes by someone who knows what factors to consider and how to weigh their value vs. cost. You can have all of your domain names point to the same web site if you choose. Whether or not to use different content for different domain names is a strategic marketing question.