The first 5 videos on this page give details of the parts of the instrument, how to hold it and basic techniques:
Parts of the Trumpet
How to hold the Trumpet
The Buzz...
Valve numbers
Tonguing
The next videos, 6, 7 and 8 show how to play the notes C, D and E
The note C played twice for four beats each
The note D
Video 9 above has 2 minims and a semibreve, you will need to play these 2 bars for your silver certificate.