Having your product or services posted over the Web is not like print ad or traditional marketing form. There are a lot of things to consider in placing your products or services over the Web. There are a lot of companies that are offering the same products or services like yours and you need to consider this. You shouldn't consider the Internet as a place wherein you can just post what you got. Considering your competitors strategy is one of the steps in planning your own marketing scheme.
You also need to set your goals in having a website or marketing your product or services online. Make sure that the your goals are also attainable. Always remember that your company's website is an extension of your business, your image. A lot of people will visit your website and may judge it. People that will visit your website might be have further questions that are not available in your website, so consider having your company's contact information, email address, telephone number or even the company's physical address, and this will also build credibility and trust to your users. Having images or logos is also great, but don't have too much of it, some users may not like it...
For a much better marketing strategy online you may also consider having your website optimized with the search engines this way there is a greater chance that people will visit and check your website. There are a lot of search engine optimization methods available and you may have your web master do it. Of course you need to have a domain for your website, there is a lot of it available just contact your Internet Service Provider or you can get one for free or even have a subscription.
Considering all the things that I have mentioned above will be useless if unless you do have an informative and useful content. The website should contain important information about your products or services.