White Board Animation

I am looking for a whiteboard animation for a new website, I already have some explainer videos which describes the products but am looking for a whiteboard animation which shows it all works. From choosing the product, paying download, editing the agreements and applying a digital signature forwarding to a 3rd party for their signature on the agreement.
Our products include 2 Letters and 6 agreements and a credit check/verification service.
I think a 3 minute animation should be sufficient. I can provide the script and maybe a voice over. No background music and must look professional
I am already overbudget and passed my deadline to launch - can you help?
Payment will be half on acceptance balance upon completion