Proprietorship firm audit for income tax

I was filing income from business of proprietorship firm under sec 44AD presumption income till last year.this year my business expenses have increase substantially and my business is not making any profit and i dont want to show 6%presumptive profit.so for audit what is procedure, how many days does the audit process takes and what all data i need to give for audit purpose of proprietorship firm.also what would be fees for audit of proprietorship firm.

Turnover of firm for financial year is 82 lakhs and it is electrical goods trading business wholesale in mumbai