I use Microsoft planner for my to do list - each thing is on a card and I can move them between the 'buckets' (today, this week, this month and future months) as things need doing. The card enable you to do mini checklists and add notes and attachments as you need to.
I also have a comms planner where I add things that I need to talk to someone about (each person has a card and I note down anything I need to speak to them about so I can raise it all at our next opportunity to catch up). Useful for things that aren't urgent enough to warrant an email or teams message but need a quick conversation the next time we speak.
When i first started my current role i had another planner for connections - each person has a card and i would make a note of their role, who they manage, responsibilities and anything useful to know - such as Emily, HR business partner, looks after 3 directorates, manages Jack and Lucy, dog called Denzil.
I also add focus time to my diary. Outlook can automate this but I find if I add it myself I can use it as a time block for things, so I might add an hour for 'focus time for board paper' or 'focus time for performance stats' etc.
I use a notebook with page numbers so if I have a lot of actions or notes from a meeting I can refer to the page number. I have tried being paper free but there's something about writing things down that seems to lodge them in my brain.
At the end of each day I plan the next day including my top 2 or 3 things to do. Last thing on Friday I scan through the next few weeks adding focus time and prep slots for meetings (I have a LOT of meetings as my role is very peopley).
Make sure you start a sunshine folder so that when you get good feedback - or even a 'thanks this is great' email - you can file it away to refer to on days when it feels like nothing is going right and you need a bit of a boost.
And good luck for tomorrow!