You can choose whether a service is shown on this page when editing it. To hide a service simply uncheck the “Show in services list” option.
To change the order in which services are displayed you can update the position field as in the screenshot above. Items with the lowest position # will be shown higher in the list.
The services page is intended as a quick and easy way for clients to purchase a service without any additional fields. If you want clients to be able to get multiple services at once it’s best to create a separate order form and link to it instead.