Desk

Chair

Don't get a rolling chair if you don't have carpet.

Monitor

Reflective LCD monitors use ambient light to light up the screen and are easy on the eyes. They require either sunlight or 4000-6500K 1600 lumens flicker-free light bulbs to function. Transflective LCD monitors and R-LCD monitors with built-in front lights also exist.

Lighting

In my experience, monitor lights tend to highlight dust on the screen and don't light up R-LCD screens much. It's best to have bright, diffuse, ambient light in a place angled behind you that won't cause glare on the screen.

Diffuser lamp shade covers exist and can be used to diffuse the light sufficiently to reduce glare from bright lights.

Keyboard

Switches

Linear
Smooth and consistent keystroke with a quiet noise.

Kailh box red

Clicky
A small bump on each keystroke with a loud click noise.

Cherry MX Blue

Tactile Preferred
A small bump on each keystroke with a moderate noise.

Cherry MX Brown

Mouse