How to oil the valves:
https://www.youtube.com/watch?v=-DTY9PzqWFA
How to buzz on the mouthpiece
https://www.youtube.com/watch?v=rALEEWsDPUo
How to read Bass Clef and play first 5 notes on Tuba:
https://www.youtube.com/watch?v=Y49D1vCaVj8