Forgot Apple ID and Computer password

Hi,

I bought a MacBook Pro a week ago and the same night with a friend and a help of a few drinks we opened it and created an Apple ID and a computer password out of nothing. I then left on a trip and a week later tried to remember without success. The only thing I succeeded is to erase all content and user data and connect to a WiFi where I'm asked to put in my Apple ID I can't remember!

I have everything, invoice, the box I bought the computer and the MacBook Pro itself, though no luck in getting back to make it work for me.

Any help on what the process is to follow to get it back to work?

Thanks