Sorry to be asking more questions but ... You say you have no assets, so are you're both living in rented accommodation? Are you living with someone else? A new partner?
Were the credit card debts you mention built up while you were both living together or has she built them up since? Are the cards in your name or hers? Joint accounts are not a good idea - what if she builds up an overdraft on them?
What is the court case about? I assume they're about the domestic abuse allegations, as you say you haven't begun divorce proceedings.
I think it is best if you are not hopng for a reconciliation that you initiate divorce proceedings now - the sooner you sort out finances the better. If you remain married then she may have a claim on any assets you acquire in years to come.
If the cards are in her name and the debt is built up since you left, I don't think you are responsible for them but someone else may come along soon and know more about this. If they're in your name, cancel them!
Depending on how long you were married she may have some claim on your pension but again not sure, particularly as it would probably cost more to share out than its worth.
With children of 8 and 9 I believe your wife would be expected to get some form of employment, even if only part time, she would then qualify for tax credits etc. With this,
child maintenance and possibly some spousal maintenance (depending on your income) she should be paying her own rent and utility bills, so even if you did have to pay off some of the debt you would have the money to do it.
Sorry if this isn't very focused help but not sure why you are paying so much in support so long after your separation...