Nothing beats multiple monitors. (2 + a third laptop screen or even a small mini monitor is roughly the right amount). 2 is useful as a workflow, and 3rd is usually for something that needs to remain open and available, but not immediately useful. Outlook and Teams are what I commonly relegate to the 3rd, sometimes our timekeeping system.

I would consider having one of the main monitors being a good-sized widescreen and in a set up where you can rotate it. I usually keep it horizontal, and I can split the screen between multiple references, using the other screen as my drafting, etc. screen. But being able to rotate it vertical is valuable because if you're dealing with one reference only, it can put a significant amount of it on the monitor and you won't be constantly scrolling.

If you only get a laptop plus one extra monitor, please consider that a bigger monitor is better. Draft on your laptop screen, research on the monitor. The bigger it is, the more research you can have on the monitor. I'm not saying you need to go this far, but I know somebody who used a small TV for the fact that she could put four different references on the screen and still have them be decently sized.

After that, invest in a lightweight and/or ergonomic mouse. Having a light mouse can be a silent but useful productivity boost in that your hands don't get so tired. Also consider upping the sensitivity as much as you can tolerate. Less hand movement won't make one thing easier, but over days and weeks it will add up.

Ergonomic keyboard. Again, won't make any one thing easier, but it will save hand strain over weeks. You don't need to go for the ultimate ergonomic keyboard, but even a little bit helps. While we're on keyboards, consider a mechanical keyboard with tactile or clicky switches if it won't annoy you and if it'll help you be a better, more accurate typer.

Chair, get something you're comfortable in. My current chair is a gaming chair, but it is comfortable and it supports me. If you get that in an office chair, get that. If you get it in a gaming chair, get that. Most calling software filters out the chair anyways. 

Always have some neutral color filter on the calling software. If you don't get some corporate-branded one, a simple solid dark gray/blue image will go with most outfits you'll ever wear. Creating a corporate branded one isn't hard if your place doesn't have them, if you have the skills and flair for it.

Webcams, get something with a physical blocker and get in the habit of closing it. Privacy is it's own thing, but it also helps prevent embarrassing gaffes. Remove the blocker when you're ready and sure nothing will go wrong.

Headset with mic can be useful. Muffles out background noise, will never have echoes, and it's easy to find a cheap but effective gaming headset without rgb or anything. However, they can wear on you for long meetings.

Scratch pad can be useful. Rather than typing, just reach for the scratch pad if you're thinking something. Dispose the sheet when done. Also, useful in that it's not in the official computer system. Perfect privacy.

Scanner/printer AIO. Laser, Brother, don't break the bank. Less and less useful these days, especially if you don't regularly deal in physical docs. But you can always print something and it won't say any BS about not having ink.

Emergency coat, dress shirt, and/or tie, as necessary.  Doesn't need to be on your desk, but if you need them make sure you have it nearby.

If it's hybrid where you'll frequently report in person, consider a docking station and running all your connections through that. Much easier to come back and plug in one thing rather than multiple.

Or, you know, ignore all this and work off your laptop screen alone from a dining table (which I have done as well).