Are you getting RL support from your employer.? I hope they don't just "expect" you to know and are letting you just get on with it. Not having any previous experience of line management and just expecting you to lead people is a sure fire way to expose you to significant risk in your role, unless your organisation recognises this and gives you a framework from which to build up your expertise.
For example, you need to have a reasonable command of your internal HR policies - who is helping you to get up to speed?
Performance development, which will be very current now at the start of a new year when objectives are often set for staff. How are you managing this?
Communications with the staff you will line manage - do you have a plan in place of how this will happen. Your team may rely on their manager (you) to communicate and disseminate information such as corporate strategy (high level direction), on which their objectives need to ultimately map to.
You can't "train" for management in a short term way, it needs to come from a combination of long term formal courses, and on the job experience
I could go on, but the key thing is having a starting place with your own management giving you support if they believe in you, and want you to be an effective and efficient leader. Plus upholding Employment Law within your organisation and the people you are responsible for which includes recognising and dealing with bullying, being aware of Health & safety and diversity), the fundamentals of line management.