Code.org

Code.org has a collection of online courses and activities to teach the basics of programming. The bulk of the resources there use block based programming.

This selection of courses is a great starting point (the links below allow you to join the Porirua CoderDojo group at code.org):

Early readers 4-6

Start with the Course 1

New coders 6+

Start with Course 2

Finished Course 2?

Try out Course 3