Register website users/create profiles over the phone?

im lauching a site where my marketing strategy includes calling potential customers and then sending them a link to sign up for my site where they create a login/password along with basic info.

i’d like to know how once i have an interested customer on the phone i create the account for them using their email and a generic or automated password - i’d then send them an email that shows their credentials and gives them opportunity to change their password to whatever they’d like.

the whole point is even though i can have a customer say yes on the phone once i send them a link to register there still will be some fallout. If i can create the account for them while i have them on the phone ill have a much higher conversion rate

(by the way registering and creatign the account is free so it only takes general infomation to create an account)