What sort of tasks should I create?

There are usually three main types of tasks:

1) organising something: e.g. Print and put up event posters

2) contributing something: e.g. Bring a lasagne

3) rota slot: e.g. 3.30pm-4.00pm 

When you create a task, make sure it make sense as something a volunteer could tick to help with.

You could even discover skills waiting to be discovered! E.g. We need French-speakers, we need guitar players for the school festival. You never know what skills are lying latent in your fabulous school community!