If you want to learn how to use a computerised accounts system. Try Xero, Sage, Intuit, or one of the others listed on UK government site for “MTD” (make tax digital).. If you don’t know how to apply transactions, get a bank account devoted to business and study a few accounting systems.
Assuming you are registering as a limited company. You’ll need to be up to speed on submitting yearly accounts. I found micro entity accounts easiest. It works around the “Accounting Equation”. But, I’d trained in basic bookkeeping. So, it still required thought and care..
It’s unlikely that you’ll think of it. But, you will need insurance for your company. Indemnity and equipment, there’s a long list.. Fulfilling through a website. Be careful. Avoid losing passwords, numbers, those kinds of things. Don’t just rely on electronics. Though its a massive assistance.
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There’s much more, but I’ve moved it accidentally. I may come back
Dave T.