Watch these youtube videos to learn how to assemble and start playing your instrument...
Flute: https://youtu.be/YVqlcwqxG7o
Oboe: https://www.youtube.com/watch?v=hXu_g79qfYQ
Clarinet: https://www.youtube.com/watch?v=zXvKWodcWeQ
Saxophone: https://www.youtube.com/watch?v=GKgjqoyi0JU
Trumpet: https://youtu.be/7Hfu3Hsj1bU
French Horn: https://www.youtube.com/watch?v=4pWoeOnwHMs
Trombone: https://youtu.be/UFBTmKS1rW8
Baritone: https://www.youtube.com/watch?v=Wbb1XN6l_og
Percussion (how to start off - snare drum - the same grip and ideas are used on the bells, which you will start with):
https://www.youtube.com/watch?v=5-Qphu0zp6g
How to oil your trumpet valves
How to give your trumpet (or baritone) a bath