Hi OP,
Essentially, the rent you receive from your property is treated like income.
As previous posters have said, there are allowable expenses and deductions you can apply to the rental income, lowering the amount you need to pay tax on.
There's a lot of info out their.
Presumably as you've only recently let the property, there will be agents fees etc you've paid, which can be offset.
There's a property section on the self-assessment form - you'll need to submit it before 31st Jan 2021 for tax year 19/20.
If there is tax to be paid, it will be calculated from the figures when you submit your return. I always leave my return to the last minute, and pay the tax due as a lump sum when the return is done - I believe if you leave late like i do. My tax due for one property let at £950 per month comes to around £3,500 once I deduct allowable expenses, and I pay in full at the same time as doing that return.
I think there's a way you can add it onto your next year's tax code if you submit early, think maybe before 31st Oct (but I never do!).
Don't panic about the Property course email -
That's automatically generated.
It's a really easy process once you get in the loop, OP. Just realise that rent is treated like income, it's not quite the money spinner that it once was but it's still viable, and you'll be fine.