Edit wordings on letter head and design envlope

Hi,

I am looking to edit details (address, phone number etc) on my letterhead (which was created 4 years ago) + want the same in word or excel format so that I can type letters/invoice directly on it, rather than having to print it on empty letter head and scan.

I am also looking for envelop design.

Please let me know ur costs and time it will take for you to deliver.

I look forward to hearing from you.

Best,
Hemal