You could get into administrative work with most levels of qualification and experience - entry requirements vary widely between employers. Some may prefer you to have GCSEs including maths and English, while others may test your keyboard, filing and telephone skills instead of asking for qualifications.
Temporary work ('temping') can be a good way of getting experience that may lead to permanent jobs. You may find it helpful to take a full- or part-time college course in administration before you look for office work, although this is not essential.
You could take a wide range of courses, including NVQ levels 1 and 2 in Business and Administration or Pitman, OCR (RSA) or Education Development International LCCI certificates and diplomas.
You may be able to get into this type of work through an Apprenticeship scheme. The range of Apprenticeships available in your area will depend on the local jobs market and the types of skills employers need from their workers. To find out more about Apprenticeships, visit www.apprenticeships.org.uk.