I think you will be fine. As you have already planned
Make sure you have place to do your prep work - a desk or a table where you don't have to put things away.
Some shelf space for folders.
Stationery in abundance (folders, printing paper, pencils etc).
get yourself one of those cheapish see through pencil cases
the bigger the better - for your personal use in school
and a strong tote for carrying paperwork about
some ppl use supermarket's reusable supermarkets own reusable canvas bag
USB stick.
Microsoft Word on your computer (not sure if you will use Power Point in Primary at all).
If the school you have your teaching practice in uses white boards ask for a copy of the software to be lend to you and install it on your computer.
Make sure they know that you have 3 kids etc, so that the school you are going to be at is as close to your home as possible.
Make sure you have library card for yourself and ask if you can put extra books on kiddies one ( in my library I can and it saves time for trips there).
Well established routine for getting kids out of the house (but I am sure you have that too).
Frozen meals in the freezer well labelled.
When they give you all paperwork read through it.
Make notes as you go along with any questions you may have.
Make sure that around the time of submission of your essays you have someone to take care of the kids as you are going to burn candle at both ends...
Find someone to do proofreading them well ahead of time for submission.
If possible start reading up on recommended literature in advance, making notes, write something - it will help in long term.
Create account on google to use their
books.google.com/
very useful and full of copies of interesting books.
Will add more if I can think of any more tips