If you're doing more than just basic Teams/Zoom and will be answering an actual softphone, you'll want a proper headset with call control integration. Mute is pretty standard on headsets but the ability to pick up a call from your headset could be important. We use Poly/Plantronics headsets with our traditional PBX customers and hosted PBX services. Having something that is DECT wireless will give you good range if you're a 'walk and talk' person like me. My phenomenal Plantronics bluetooth headset is great if I'm sitting at my desk but I tend to get up and walk around so the connection will dropout. I've switched to my DECT wireless headset and it's significantly better. I'm currently using this headset:
https://www.poly.com/ca/en/products/...i/savi-8200-uc
We've also just started deploying Yealink headsets which are a bit more affordable. They seem to be working really well with our softphones.
I would also recommend investing in a proper chair. If you're going to be sitting all day then you'll want proper support. We used my partner's wellness spending and some cash kicked in from the boss the get me a nice Steelcase chair. $1100 very well-spent.
This one is personal preference but for dual monitor setups, I prefer stacked instead of side-by side. If you do side-by-side, I would recommend having one monitor front and center with one off to the side for less important information. Constantly craning your neck side to side can cause strain. Having a primary, centered monitor is also really helpful.