Who did you call? Some of your questions are probably more for the module team and some would be for the library service and some are just general student support.
If you've only just registered today your StudentHome page probably won't be active and fully set up yet. Once it is you will be able to see all of that information and more.
How far through the process are you? Have you submitted your entry requirements paperwork?
The course you're talking about starts in a few weeks so they will start issuing those details and launch the module website before the course starts. If you start looking around your StudentHome page once you have access you will find more details being published.
There will be an online forum for your module to discuss with other students and your tutor. You will be able to contact the tutor by email or phone with questions. Tutorials may be one per TMA but details will be on StudentHome. The part 2 module description lists a series of one-to-ones with the tutor at various stages.
A lot of your questions can be answered on the OU website.
Library support is pretty comprehensive and your questions about SCONUL are answered here: https://www.open.ac.uk/library/services/students
They do regular live webinar sessions on using the library and study skills.
https://www.open.ac.uk/library/training-and-events
Plus student support services plus computing support:
https://help.open.ac.uk/
It's a big decision, I think it's normal to have an adrenaline crash and a bit of a wobble after taking the step. But don't panic yet!
Worst case scenario - from memory you have 14 days to change your mind, and I would have thought you would have received comprehensive information by then.