Below are some exercises to get you started on clarinet. They are presented here on the web page but you can also download the PDF files and print them for use on a music stand.
There is so much more to learn and play! I have provided just a fraction of exercises and studies, these are a great place to start but consider playing other music and methods. Below are some further study materials for purchase at your local music store.
Recommended further study:
First/Second Book of Practical Studies for Clarinet, by Nilo Hovey
Tune a Day, vol. 1 and 2, by Carl Herefurth
The Progressing Clarinetist, by Leon Lester
Stark -- Arpeggio Studies, op. 39; Opperman -- Daily Studies