Minecraft can get seriously intense depending on which resource pack your using. ( Unless just using the Default ) .
Computer Desks ( Keep a good Posture )
Tribesigns Gaming Desk with with 2-Outlet & 2 USB Ports, 55 Inch Computer Desk with Monitor Stand, $179.99
https://www.newegg.com/p/3EA-007X-00013?Description=gaming%20desk&cm_re=gaming_desk-_-9SIBF65JBU5862-_-Product$179.99
Gaming Desk 58 with LED Strip & Power Outlets, L-Shaped Computer Corner Desk Carbon Fiber Surface with Monitor Stand,
Ergonomic Gamer Table with Cup Holder, Headphone Hook, Black
https://www.newegg.com/p/3EA-007C-00004?Description=gaming%20desk&cm_re=gaming_desk-_-3EA-007C-00004-_-Product$189.99
Comfy Computer chair brands
Fantasy Lab on a budget , standard warranty. Squeaky ( may want more grease in summer )
Secret Lab way better & have the worlds best customer Support/Service, and lifetime Guarantee warranty. Super Quiet.
Finally the computer build ( Intel )
https://pcpartpicker.com/list/Vzvrzf $1,400 Build it yourself to support the latest games on medium settings.
Budget Prebuilt to handle minecraft. $750
Anything Intel 12Th Gen or newer
Anything RTX 2080 / 3050 or newer.
* Note * Gaming Laptops Start out at $499.99 , and Most places like wal-mart have a lot of them on clearance right now ( normally $1400 , now 749.99 ) or normally 1,100 now 699 ect.
Hope this helps, good luck !