Thanks so much for reaching out to me! I’m so happy you are thinking about freelance writing! It really is a great way to work at home! As for your questions, clients won’t be bothered if you contact them in the evening. I work with clients in the UK, Germany, Tel Aviv and more! So, what’s my time is not their time! I would suggest though to try to wake up before you work to answer emails and pitch, even if for 30 minutes in the morning.
A word of caution: Remember that where very little is required, very little is offered. These jobs don’t pay much, and they are not going to provide a reference for your resume. It may take working at several different of these online jobs to pull in the income you want. And as always, know the signs of a work-at-home scam as you sort through the opportunities.