Salary proof confusion: please help

[Rb]

I am a freelance employee which means that every week I submit an invoice via email to the company for the hours worked. They use direct deposit to pay me and I get a pay stub (on letterhead) in the mail that says the amount.

Will I need to have both my pay stubs AND invoices signed and stamped by the company?
I don't think my company has a stamp so will signatures suffice?

In addition to the invoices and pay stubs, I am planning to include the following:
- Original bank statements which show all the deposits from my employer.
- A letter from my employer stating that I made the claimed salary
- My tax records from period claimed.

Any advice will be greatly appreciated.