I'm just trying to be prepared so that when I do come to planning and teaching I have everything in place. I would rather be prepared than trying to find things out at the last minute. I've not been sat on a computer at all and I don't plan to be.
Please take this with the good will it's intended, but at this stage in your training there isn't anything to get in place as such. You're a matter of days into your training year.
You're in danger of making a common mistake that some trainees make of being 'busy' or fretting unnecessarily but actually you may well find yourself doing extra work because so early on you're not in a position to be getting ahead with placement stuff.
(This may just be me so others may do it differently) In my experience the first couple of weeks:
Trainees usually do some sort of school audit about catchment, school etc to know the context of their school
Trainees observe within the year/subject they are likely to be based
Trainees will so some cross key stage/cross subject observations
They might observe a specific child for a day e.g. SEND
When observing, they're watching the teacher and making notes, reflecting, thinking about how it links to the early steps in theory with their ITT provider
Brushing up on some subject knowledge
Looking at books and seeing how things are marked
Meeting with the mentor to discuss the logistics etc which might take a couple of weeks to sort out.
Trainees often don't have their timetable until a bit further in. With no timetable means no class information & with no class information then there's no meaningful prep to be done.
Take a step back. Your mentor is probably still on a full (or reasonably full) timetable. They got back to work a week ago. They've taught a full 6 days of lessons and are getting their own class/classes sorted and set up for the year. They have their own schemes and planning to sort, their own datasheets to create, their classes to get to know. Then they will block of time to allocate to mentoring a trainee for a specified amount of time a week. They will then start deciding what the timetable will look like for the trainee and will also be aware that they need to check ITT logins, network access, copier access, IT arrangements etc for the new trainee. But right now the trainee isn't teaching, isn't about to be teaching and they have more than enough to be getting on with that doesn't require a school laptop. So the mentor will get to it, but not in 48 hours or so when they don't get any extra time or pay.
It's clearly a logistical issue that needs a solution. Ask your mentor in your meeting but be aware that mentoring trainees is a significant job that mentors don't get time or pay for (so sorting non urgent IT issues in the first days of term is unlikely to be a priority & is more of a end of 2nd week when things have started to settle issue).