Hi and welcome to the site, if you're still looking to make a decision on the optional units you can view the level 3 pdfs on cwdc -
through this thread.
Other suggestions are to ask if you can have copies of all the setting's policies, procedures, welcome book/prospectus, a list of possible roles and responsibilities, any risk assessments or planning systems in place all these will help familiarise yourself with the operational side of things.
maybe find out who and where your early years department is - take a wander around your local county's website and see what your children's services are all about, you can also take a look at
getting to grips with reflective accounts.
Silkysteps has lots of information on many topics you are very welcome to browse through.
I hope you enjoy everything & look forward to hearing how things go.
Ruth
xx