Jobs and careers
Careersbox - gives you in-depth information about different types of careers from the people who do them.
Horses mouth - will link you to mentors going different types of jobs - the next best thing to a work placement.
Success at school - a national careers advice site for school students aged 13-19 that also provides free intranet databases for schools to deliver careers advice in the classroom. The site is currently partnered with over 30 schools across the country. Success at school includes information on career sectors, advice articles, a forum as well as a job search tool to explore current opportunities.
Courses, training and apprenticeships
http://www.ucasprogress.com/ gives detail of all the different courses, schools, colleges and work based learning across London
If it's apprenticeships you're after, this is the site for you: http://www.apprenticeships.org.uk/
For training and recruitment in IT: http://www.justit.co.uk/
Help starting a business
To find out more about university visit http://www.ucas.com/
Part time jobs
Central London Connexions
Provides information, advice and guidance on courses, careers, jobs and training opportunities for young people aged 13 -19 years (and up to 25 years for those with learning difficulties or disabilities).
If you're still not sure, why not try your skills at volunteering?