Confirmation on Next Steps in Resignation

Good evening everyone, I am looking for anything that I missed in my resignation process at the moment.

I am currently working for a company that isn’t following a few things in the contract, so I applied for a job and got accepted.

Now I have already signed a contract with the new company, and have turned in a resignation notice. And from what I gather the next step would involve just rendering the remaining month and getting the following documents in the last week.

* Welfare Pension Insurance Card

* Withholding Slip
* Employment insurance card
* Pension book

After that, the only remaining thing would be to inform the Japan Immigration office later on within 14 days, when I start the new job. or Should I already inform them? (Did the 14 days already start when I signed the contract? or is it the starting date?)

And then concluding with the notification on my own’s country government.

I wanted to confirm with everyone, as this has been a stressful situation for the past weeks as the company’s boss has been meeting me almost every day, asking me many questions. Ranging from what will I do, to saying I should go home. Now, my answer has always been “Nothing is finalized yet”, but it has been draining and giving me a bit of anxiety confronting the barrage of questions.

In any case, I don’t want to make this a long post about the situation and more on the next few steps, is there anything you think I missed or I should do? Any tips are also welcome!