Hi Sloppy and welcome to the forum.
I have been committee managed for 30+ years, I would start with a conversation with the manager and ask how they see your role in relation to theirs, my committees have been more about fundraising and making fee/wage decisions, but I know some committees are much more pro-active and deal with finances (or have an admin), do staff supervisions and appraisals (I expect the chair to sit in with annual appraisals), personally I’d like to be asked now and again if everything is ok.
I make sure my chair knows the safer recruitment procedures as they are the employer, who is responsible for what roles in the staff team, make sure they have a copy (or link) to the statutory framework, maybe ask the manager to take you on the learning walk as they would for an inspection, it will give you an insight into how and why things are done as they are, spending some time in the setting will give you an idea of the challenges staff are facing.
As Cait says EYA (if members) have lots of info and you’re LA will likely officer training. Good Luck and we’ll done for taking on the role.