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You are almost there. The differences between html and xhtml are slim, but essential. However, if you know html, that will not be an issue.
The main difficulty is that there is hardly any reader which supports ePUB v3. The readers that do support this, have different ways of implementing audio/video although there are some commonalities. Apple has adapted the ePUB v3 to support certain stuff, but it is not real ePUB anymore.
Embedding is not that difficult I believe, but you have to test it on all v3 readers to see if it works. The format is still too new.
Personally I don't see added value in audio/video for the bigger part. I can see some limited benefit in special case books, but even there I never missed it. If you need audio/video, it might be better to create an app for it.
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