Your first week — Backtracking

Record an expense and attach its receipt. Mark it as paid personally if you paid with your own money.
Import your company's bank transactions from a statement or connect a bank account.
Categorise each bank line and confirm the proposed categories. A proposal is not a confirmed decision.
Match company-paid expenses to the bank lines that paid them. Personally paid expenses go on the director's loan account instead.
Open your VAT return for the quarter and check what still needs attention.