Help with tax return for foreign property rental

Hi
My husband and I own a property in Ireland which we started renting out in 2017. I have been advised that as this is classed as income, we need to pay tax here in the UK. I have a few questions I am hoping someone can help with before I have to seek help from a financial advisor/tax advisor. Thanks in advance:

I am a stay at home mum but my husband is in full time employment earning 25-30K. The helpline for self assessment advised we need to each fill out a tax return form (neither of us have experience with submitting a tax return so apologies if these questions sound daft).

Do we split the income we earn on the house in half and each fill out our form for 50%? I would imagine that I will end up not paying anything as it would be classed below the personal allowance? (we make the equivalent of £12k a year in rent before tax etc)

When I fill out my tax return in Ireland I am able to first deduct the amount of mortgage interest paid, house insurance and repairs etc. When I am doing the UK tax return can I do the same?

Many thanks!