Hi! I'm an Accounting & Finance student so i may be of some help to you!
My understanding is that if you have made over £1000 in self-employed income this must declared to HMRC via self assessment tax return, regardless of whether you were profitable for the year or not.
You mentioned you earned over £1000 over the previous tax year, by which i assume you mean 6th Apr 22 - 5th Apr 23. If so, you should have contacted HMRC by 5th October and have filed a return online by 31st Jan 24 (or 31st Oct 23 if choosing to submit a paper return). Obviously the deadline has passed, since we are now in February, so you may need to pay a £100 penalty for having filed late.
I think in your case the best thing to do would probably be to go to your local accountants / advisory firm and ask about next steps - they will usually be able to offset your income against your costs relating to your trade (but unfortunately not your penalty) and they can file it with HMRC via iXBRL tagged returns. It will cost a bit - if you have your accounts in order i would say any competent accountant would spend no more than 2 hours on it, so i would estimate self assessment + penalty would be somewhere in the ballpark of £200.
Alternatively you could try to contact HMRC yourself, fill out your self assessment yourself and pay the monies you owe, but do be aware if there is a mistake on your return, deliberate or accidental, HMRC can charge impose further penalties. Since you mentioned having no experience with tax, this isn't something I would recommend.
Barring the two options options above, if your income is only very slightly over £1k, (I'm talking pounds or 10s of pounds here) you could ignore it and hope HMRC do not flag you on their system. Again, this isn't something I'd recommend as the system HMRC use, Connect, is very sophisticated and can catch you out, and since that would be treated as deliberate evasion, the consequence for doing so would be much more severe.
Hope this provides a bit more clarification as to your current position!
Other users, if i have made mistakes anywhere please to feel free to correct me.
(For legal reasons this isn't financial advice)