Hi Lotte! It's always a bit daunting starting off, but if you've done a TEFL course, I'm sure you'll be fine :) There are loads of helpful resources online. I would recommend doing the 'teaching English online' course run by Cambridge assessment: https://www.futurelearn.com/partners/cambridge-assessment-english
Even if you don't only want to teach online, the course talks through lesson structures, activities and classroom management online and offline.