The five-minute video 學寫西藏字母 How To Write Tibetan Alphabet by Lhaike Digital Culture Inc. (LDCI) shows how the Tibetan basic alphabet is written. For each syllable, it gives the pronunciation (in speech and in transcriptions in the Latin alphabet, Zhuyin Fuhao and pinyin), if applicable, the meaning (in English and in Standard Chinese using traditional characters) and an animation that shows how to write the letter.
The YouTube video The Tibetan Alphabet by David Curtis of the Tibetan Language Institute in Hamilton, Montana (USA) provides an introduction to the Tibetan abugida which focuses on pronunciation but does not show how the syllables are written. The video is part of a longer course that is taught by conference call.
For a slower and much more detailed tutorial, you can use the YouTube playlist The Tibetan Alphabet by the Tibetan Language Channel. These are video recordings of real Tibetan language classes, in which the teacher provides a lot more information about the pronunciation of each syllable. The playlist contains 11 videos of at least 10 minutes each. Strangely, videos 1 and 2 are not in the list.
I have not yet found resources that explain how to write characters such as ༒.