Do you successfully get it setup, such that it is connected to a network and monitor? Will it correctly reboot at that point? Are you connecting of ethernet or wifi? What are you using as a monitor? What exactly do you mean by "its not booting"? No indication of activity on the leds, nothing displayed on the monitor, or what?
8 GB is likely too small for a Full Buster install. Buster Lite would fit. Once you do the initial install and get networking and a monitor setup, run
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sudo apt update
sudo apt full-upgrade
"apt" is the better command for interactive use.