Although I like chords and advice, the book is much simpler that video lessons, where Justin sometimes shows more advanced strumming and explains nuances of playing: for example for "Mad World" there is explanation of more advanced technique and intro playing, and for "House of Rising Sun" video contains explanation how to play it in style of "The Animals".
In order to sign up for this program, you simply go to the official website where you can initially sign up for a free membership and join the other two (2) million members right now. There are three different levels of membership that you can choose from, including a free basic membership that will give you access to 12 instructors and 24 lessons.
As a beginner, it is best to avoid making a pawn shop, flea market, or yard sale purchase unless you are shopping with somebody who has experience in purchasing a guitar. Having never purchased a guitar, you may not know what to look for in terms of damage or guitar quality. With that being said, a local music retail shop is your best bet. You may also shop online with a reputable company, although be sure to review the business’ return policy.