Registering a partnership firm involves several essential steps. Firstly, partners must decide on a suitable business name that adheres to legal guidelines and does not infringe on any trademarks. Next, a partnership deed, outlining the terms and conditions of the partnership, must be drafted and notarized. Following this, partners should apply for a PAN (Permanent Account Number) and TAN (Tax Deduction and Collection Account Number) for tax purposes. Lastly, the firm should be registered with the relevant Registrar of Firms in the state where it operates, completing the formal registration process.