Your compost is ready when it looks like dark brown soil and has a pleasant earthy smell. This could take anything from 3 - 12 months.
If you are adding lots of small pieces the composting process is quicker - the decomposers have a bigger surface area to work on.
If it contains bits that have not decomposed properly, just put them into your next batch of compost.
You are ready to use your lovely compost in the garden or for pot plants around the home.