Hi @Benjamin Ellis ,
To estimate issues first you need to set up a Scrum board. The board accepts various types of estimations (you can check them out here). Assuming you are using story-points then on the backlog view you will be able to set the story-points for each activity.
About logging time (aka work log), you need to ensure Time tracking feature is enabled and voilà, Log work menu is available.
Check this article out to know more.
Regards,
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