Writing a successful homepage copy involves much more than simply outlining who you are and what you do. You typically only have about 10 seconds to attract the attention of your viewer with the content of your page before they simply go elsewhere. Therefore, it needs to be brief and directly address why the viewer specifically needs you.
This doesn't mean writing a flowery paragraph about how your customer service is better than everyone else and how friendly your staff are. It means really getting to the root of what issue has forced the viewer to seek out your service, lay it out for them boldly and state what it is that your service does to eliminate the issues.