Congratulations! This is good news to hear.
Talk to people and ask about their areas of interest. Ask about what plans and changes are in the frame for the first 6 months, if they don't tell you this. Ask about any virtual networks and newsletter lists you can join (where I am, these range from sustainability, to carers, to professional development, but they also go a long way towards the social opportunities and so it's helpful to widen contacts when things are in remote mode).
Be prepared for some of the mandatory training to take a bit of time to get hold of (e.g, we are currently doing it remotely and need to use 3rd party packages for certain things that are linked to the timescale of a new contract being loaded in several systems). If there are parts where external legislation applies as a small bit of an internal process, it may be useful to inform yourself around this a little from websites, webinars etc. One example that looms large for me is the IR35 legislation as it applies to contracting freelancers or small companies for project work, something that has a few thorny issues.
If you can, try to keep some time and perhaps, even templates, for reflecting on your initial months, and evaluating how you think things could be of greater use, or progress differently, which could help with your probation meetings.