A "typical" main page is a dashboard of sorts where visitors are presented with the key information that helps them navigate further around the site. It contains some recent highlights, such as recent news, featured products, employees, or anything else.
If you don't have enough content to have a "typical" main page, do you know why people visit your site in the first place? Is it to find out about your company, your products, see some photos/drawings/screenshots, or to download content? Chances are it's not about your company but about your product but talk to some customers (current and potential) and ask them what their goal was. Their answers will be your main page content.