Based on my experiences, in the very beginning of your day at the office, I'd recommend to tackle the work item which has the most odds of being completed in a certain time frame.

Let me elaborate - If you have a TODO list of N work items that could belong to one or more of - Set A - require more thinking Set B - require larger communication overhead Set C - have a clear go-to strategy and can be broken into multiple items

Then, picking up the items more inclined to Set C right after you reach the office might be a good strategy. The obvious reasons are a. you know what to do and b. you know how much time its going to take