This is a popular tutor book for beginners, starting from ‘where is middle C’ and going as far as using all the lines and spaces on the music for both hands. As well as the pieces included in the book, there are extras pieces which you download from the official Piano Time website here at the Oxford University Press.
The first six pages use the notes you can play with both thumbs on middle C. Later pages pages will need you to know more notes.
Even if you have been learning for a while, it is still worth having a play through these beginner pieces. The more new music you play, the better you will get at reading the notes!