OverrideModuleUsernameGeneration and PreModuleChangePassword

[dpgthing]

Hello Dev World.  I must apologize upfront!  I am very new to development and understand vaguely the lingo, so please take it easy on me.  I've read up a little on the 2 hook functions in the subject, but I'm looking for a precise answer to my inquiry.

How do I set the product username equal to that of the client's email address upon the client clicking "Complete Order"?

Also, how can I change the password complexity of the generated product password?  I would like it to be 10 characters to include only: 123456789aAbBcCdDeEfFgGhHjJkKmMnNpPqQrRsStTuUvVwWxXyYzZ  (you'll notice I left out the 0, iI, oO, lL.)

So essentially the end result of the hook function would be:
Client Profile
First Name, Last Name
E-Mail
Address
Phone Number

Product/Service
Username = "E-Mail"
Password = randomly generated 10 characters to only include letters and numbers excluding 0,iI,oO,and lL

I have attached an example of a product/service which has MANUALLY input information, and instead of me having to manually input on every order, I'd like this to be done automatically as when a product is ordered.  Thank you for your help in advance!