U mean the whole company ? or a specific area like expense, income, asset etc There are infinite steps to audit a company. U can only limit the checking through past experience of the same client and observed weaknesses. 
U can print a trial balance and take the biggest ledger or each head..for e.g direct income - sale of X (which is the highest value in the head direct income). take invoices, check date, amt etc. similarly verify loans, advances, deposits, assets etc. Just verify the assertions of trial balance