eastbono - at the very least refrain from posting inaccurate information.
OP - first off, you need to separate your finances, you can't budget if you are still using a joint account.
If your wife is not working, you can be assessed for spousal as well as child maintenance. The one positive about spousal maintenance is that it can be offset against your income for tax purposes if paid under court order. No such tax break is available for child maintenance, but you can claim an additional tax credit as a lone parent.
Child maintenance is based on both parents income and expenditure; you'll find a good spreadsheet for this on
www.solo.ie.
If you want to keep your share in the equity of the family home, then you will have to continue to pay your share (note
share) of the mortgage.
You also need to consider a parenting plan for your children, life assurance, pension plans, savings etc.,
I would strongly recommend that you both attend mediation in order to come to an agreement on these issues. This can then form the basis of your application for a Judicial Separation; the court hearing need take only 10 mins if you have everything agreed beforehand.