How to know exact keyboard code for replacement?

Hi, so I bought a salvage Mac book 12” a1534 2991 rose gold, as my first Mac.

i managed to get it up and running but the only button on the keyboard that works is the power button.

i live in Kenya, and I need to replace the keyboard.

ive looked online for several, and I saw the options of 1.) keyboard alone or 2.) with the top case ranging from $100-$200.

my main concerns are how to know which exact keyboard to select, being as far as I am from any of the sources.

please let me know which would be the best option, how to pick the correct type and what should be the best price point.

thanks in advance.

God bless