Imac 2009 27inch

Hello

I have used oclp on my macbook mid 2012 having maxed out specs running sonoma, It runs flawless. I want to upgrade my Imac 2009 27inch which has 16gb ram Radeon 6770M 512MB graphics to Monterey . I need it on that version as my mom uses it for youtube and chrome (basic computing ).

Could you'll help me with things that occur while setting it up that I should look out for? I saw few youtube videos and the 1st thing I saw was that I needed was a wired keyboard and mouse, which I didn't need on the mbp. So my bluthooth apple keyboard and mouse won't work during setup ( for efi bootup).

And what about the gpu failure? Is it common? And how to fix it..?

What are your opinions should I follow?

Hope this message finds you well, Have a great day.