1) Solve the captcha from the yahoo account creation. Please use iMacros scripts to do it, some decaptcher providers have already developped some sample iMacros for use.
2) Solve the captcha from the Adwords account creation. Same as point 1.
3) Open the yahoo email and click on the verification link.
3 freelancers are bidding on average $67 for this job
I can solve your problem in a moment. I use for this purposes one function which I created with my own hand. It uses [url removed, login to view] service for captcha, where 1000 recognizing captchas cost only 1$.