The most important aspects of a service or product listing page, are the headlines for each of the items. Every product/service listed should have a headline and an opening hook, designed to get your reader to click on the item to find out more.
This page should contain the services you provide, or products you offer, that are most likely to turn a visitor into a customer. As with all pages on your site, establishing credibility and trust is important for a successful online business. Try to offer as much clear information as possible, without being too wordy. If you can, reassure visitors by including text that reinforces credibility, such as awards, recognition, testimonials, and guarantees.