Give me some advice on my to-do list after landing in japan and starting language school

I will be moving to Japan and attending a language school for 2 years and job hunting on the side in the hope that I can stay longer

My to-do list so far:

1. Get the residency card at Haneda

2. Register at the local city office where my dorm is

3. Get a phone number with my foreign credit card (I've read that this is possible even without a Japanese bank account, but would love some clarification)

4. Go to JP Post Bank to open an account and get a card of some sort.

One big question for me is banking: from what I've read, you can't really go to any banks other than JP post until after 6 months of residency, but JP post is kinda bad at everything. JP post website says they give a cash card only when you open an account and debit card is another application. Is a debit card necessary, or should I wait until I can work with a better bank? I've paid my tuition and dorm fees already, so I shouldn't have a lot of big spending

That's what I've planned for the immediate steps after landing. Does this look good? Did I miss anything? And if there's anything that's not urgent but you recommend doing, please let me know as well. Thank you!