OPENEVSE integration, total Rookie needs help

Hello, i am desperately trying to tie in OPENEVSE into my Home Assistant.
I am relying on this mqtt based suite contributed by Mathieu Carbou https://gist.github.com/mathieucarbou/92a3d5e0dc38d6b68aa1bdaf153a80c5

I followed the instructions on github to my best knowledge but i am unable to get this thing going.
As far as i can tell i have several issues with the openevse_integration.yaml and …mqtt.yaml files:

I have no idea where to even start here, any help pointing me in the right direction would be highly appreciated.

Don’t post screenshots of code. No one can read them. Use code tags <> and post your yaml code.

the files are the ones hosted on Github, unmodified.
I am sure i made mistakes integrating this to my HA.
I hosted a project on Upwork in case someone is interested coaching me here:https://www.upwork.com/jobs/~021883904864387023323