Invoicing clients shouldn't need accounting software. Fill in what you delivered, set your terms, and send a clean, professional PDF — whether you bill by the project, by the hour, or per deliverable.
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Your name (trading name is fine — a registered company isn't required), contact details, a unique invoice number, the client's details, an itemized list of what you delivered with prices, the total due, and payment terms including how you accept payment.
In most countries you can invoice as a self-employed individual using your own name — just make the invoice clearly from you, with your contact details and a consistent numbering scheme (e.g. MC-2026-001). Tax treatment varies by country, so check your local rules or ask an accountant once you get going.
State a due date and a late-fee policy on every invoice — for example "5% after 30 days" — and send a polite reminder the day after it's late. A professional-looking invoice with clear terms gets paid noticeably faster than a vague one.