information required regarding hsmp extension

Dear Friends,
i have to apply my hsmp extension on may 2011 . i have confusion and wants help to resolve the issues.
1. when i submitted my initial application i present a letter to embassy from my university that degree taught in english. now i have to do ielts or other english course?
2. i dont know about my accountant i ACCA or not is this important to know?
3. i am working as self employed and as well as doing business accountant letter and bankstatments are enough for me?
i am applying for myself for my spouse and two kids i have 3500 pounds in saving account is this ok?
4. as a self employed i will send the invoices from my company signed and stamped and for other income what documents required other than bank statment.
i have to apply in may hope you will give me helpfull information although i could prepare myself.
thanks,
ahmed kamal