ADVICE NEEDED URGENT- FOR SELF EMPLOYED

I have been working as self employed for the last 5 months and i do some part time job as well. My visa expires in two weeks time.
I have gone thru some of the self employed topics in this forum and understand that the documents need for self employed (pls correct me if i m wrong).
1. Accountant letter- Gross and net income for the period from xx xx 2009 to xx xx 2009 claimed and breakdown net income(amount credit into my bank acct.)for each month covering that period.

2.Accountant letter-Invoice verification for the period claimed explaining working period for each invoices(have my own word format), gross and net amount earned and date of payment into my account.

3. Bank statements for the period claimed.

I have got my payslips and bank statement for my part time job as a proof for my earnings.

I still have doubts on self employment docs and pls help me if i need any more documents as a proof for my self employment earnings.
Thanks,
Sen...