The most common scheme for startups is the NEST pension (a workplace pension) http://www.nestpensions.org.uk/schemeweb/NestWeb/public/home/contents/homepage.html
You can opt for another pension if required. Unfortunately, we cannot choose a pension scheme provider on your behalf. You may of course already have a pension scheme in operation and may wish to use this as your qualifying scheme for auto-enrolment, you would need to check with your current pension provider that the scheme is eligible under the regulations.