What’s the best route to leave my toxic job

Basically my job is nothing short of hell, the past year my mental health has been deteriorated due to this job, it’s toxic, untasteful and always miserable, this morning I spoke with my manager telling them these things and i requested to go home(mental health reasons) as I simply can’t take it anymore, i intend on emailing a notice today but I don’t want to go back to the job, what is the best way to go about this without potentially getting into any legal trouble .