From what I remember when I did it earlier in the yer
1) Yes, enter the refund amount and tick the refund box
2) This is meant to be your estimate of the amount of tax you will owe for the tax year 2023. AFAIR, the idea is that you estimate your tax bill for 2023 and you're meant to pay something like 90% of that with your 2022 tax return. It's aimed at businesses etc. I've had to fill in Form 11 for many years as I have EU deposit interest. I generally make some AVCs not through payroll so that I can claim some tax back on them and therefore am always expecting a refund in my form 11. So, I submit 0. But if you think that you will have a tax liability in 2023 (e.g. EFT sale or deemed disposal), then you may need to enter a value here. I don't know if Revenue actually follow up if it turns out that you do have a tax liability the following year and didn't make any pre-payment in the case of individuals not in business.
3) Assuming you're not making a payment for 2023, yes tick that box.
AFAIR, you will also need to enter a 0 in one of the two boxes after that for either CGT or CGT refund in the next page (unless you actually have any CGT to pay or be refunded).