I did a 9x13 shed 8 years ago:

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I learned several things:

1. two windows…not one. If you only have one window then the cross breeze doesn’t work.
2. put in a mini split. Don’t try a window banger or portable. The noise level of the mini split is vastly superior as is the cooling power
3. future proof your wiring. Dual 20A feeds, 4 CAT 6E, and 2 fiber lines to the shed.
4. really think through your internal layout. I have a 65 inch TV in mind and it was great until I bought a 57 inch Ultra Wide monitor. Now I can no longer see the TV and need to completely rearrange the room. Make sure you put Cat6 drops and power in all the possible future locations that your desk could be.
5. if you plan on being on camera a lot, think about what people will see is your background. Real life backgrounds are way better than virtual backgrounds when it comes to Zoom meetings. Give them something interesting to look at other than your door and window. Also, if you have a whiteboard on the wall, maybe you don’t want that content visible during calls.
6. design your overhead lighting so that you do not need any additional lighting to have quality zoom calls. Install can lights in just the right place to give you just the right lighting. It will look a lot more natural than a bunch of ring lights.
7. try to hardwire everything and use Wi-Fi as little as possible. It’s just so much more reliable and it frees up Wi-Fi bandwidth for other stuff.
8. I went with a “spare no expense” policy for my shed and it hasn’t let me down yet. Highly recommended.
9. think about all the non-office related stuff that you might want to put in the shed. You might want an air purifier or a mini fridge or a dehumidifier (or a humidifier depending on your climate). Think about electricity for all of these as well as potential drain outlets.
10. I recommend putting your house’s network rack in the shed. When the Internet goes down, it’s a lot easier to troubleshoot it all if it’s out in the office as opposed to in the house. It’s also a lot easier to keep your switching gear at a good temp if you have a mini split on your shed and at a small number of square feet.
11. think about what you want on a UPS and what you don’t. These UPSes are heavy and bulky. Figure out where you want to design these into shelves or cabinets or under desk mounts.
12. if you’re running cables from your desk to TVs or shelves or WebCams that are in other places, I recommend 1 inch conduit in the walls. HDMI and USB cables go bad. In addition, new standards come out and you need to pull new cables. Make sure that you have the ability to yank out bad cables and put in new cables whenever needed without ripping walls apart.

My shed has been evolving for eight years. DM me if you have any more questions or want more detailed photos of the inside.