Your server does not change normally, because the server normally runs behind it and Cloudflare is positioned in front of your server.
So for the server there should not be that much changes, the only and most importand thing is, that the SSL cert and private key must not be handed out to 3rd parties.
I know the problems of financing and handling servers operated as hobby project and people thinking "one has to do something" :-). So it was just an idea from my side.