Here's how you can get someone to an individual scene by using hashes (@markhunte mentioned above): Linking to a specific scene from inside and outside of a Tumult Hype document
For linking to a timeline, is this a button where the Hype animation is already embedded or is this a link to a new webpage where the animation is embedded?
The basic code for a button outside of Hype which you want to control a HYpe embed looks like this:
<button type="button" onclick ="HYPE.documents['scenes-transitions'].showSceneNamed('Scene2',HYPE.documents['scenes-transitions'].kSceneTransitionPushRightToLeft);">
Show Scene 2 (Push Right to Left)
</button>
(This is via this part of the documentation)