If you have netflix, play any episode of a Netflix original and put the audio description track on. You should get a good idea how it should sound like and how much needs to be described.

OK, here are some things I'll say from when audio description has been done less than stellar. If you do side chain / duck the audio under the voiceover, don't overdo it. I wouldn't try to narrate as you go, what i'd do instead is watch the video and make a script you can read as the appropriate things happen in the video. Take advantage of less busy things in the video to tell of the things that are about to happen, i.e. sometimes in audio description, the scene is described just before it happens to avoid cutting over dialog or action sequences. Try to be concise, but as in formative as you can.

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hth and gl with it. It's a bit of an art form, and I've seen really well to pretty bad. Even if yours doesn't turn out 100% like you'd like, you still put forth the effort and mad props / respect for considering us.

This is my passion! Here are general guidelines published by the American Council of the Blind.

https://www.acb.org/adp/guidelines.html

Good on you for doing this! One of my goals in life is to make audio description as common as closed captioning.

This is a good thread, please do upload your work.
P.S. I was moderating a conversation with a group of blind people, and we reviewed quite a few selections from Netflix. It got interesting when we played the explicit part of a movie; everyone started talking about the things that are not described. Everyone in the room agreed that descriptions of the characters are important; they wanted more descriptions on how they looked physically and what they were wearing.