Most of the Bios do’it automatically. If a GPU is detected it works with the GPU.
If no GPU, iGPU is activated automatically.
There is also a setting in the BIOS where you can manually enable or disable one or the other.
This is the usual situation, but as you did not give any indication on your motherboard, exceptions exist
Not quite sure what the question is or what a tutorial would actually be. The process is inserting the GPU and then connecting the monitor to the GPU instead of the motherboard. From your post, it sounds as if you're asking about something more specific, but I'm not sure what.
What I meant was if I have AMD Adrenalin drivers because I've been using an integrated GPU for a while, do I need to uninstall it first before inserting a dedicated GPU and then installing the dedicated GPU drivers?