Here are some guides that you may find helpful:
General Osteopathy FactSheet.pdf
The General Osteopathic Council: http://www.osteopathy.org.uk/
The Foundation for Paediatric Osteopathy: http://www.fpo.org.uk/
Postural Advice on sitting correctly:
Advanced Seating Designs: http://www.asd.co.uk/guides/how_to_posters.htm#download