There are a number of great resources on the internet about type 2 diabetes.
Diabetes UK provide a good overview here: http://www.diabetes.org.uk/Type-2-diabetes/.
The NHS Choice page on type 2 diabetes can be found here: http://www.nhs.uk/conditions/Diabetes-type2/Pages/Introduction.aspx
A more scientific overview is available via Wikiepedia: http://en.wikipedia.org/wiki/Diabetes_mellitus_type_2
Patient UK also provide a good resource: http://www.patient.co.uk/health/type-2-diabetes