Before coming along to your first lesson you might want to get started. Here are a few materials which will be useful.
There are a few different ways to tune your guitar. The easiest is to use an app and I'd suggest
Here is a sheet on a few different methods too. gallery/tuning the guitar pdf.pdf
Your first song will be Greensleeves. If you watch the video below, I am playing the melody while Arran is playing the open strings which you will try. Keep your part like a clock ticking along. Here is your music gallery/the strings and greensleeves pdf.pdf
Your next move is to use the pick and fingers of the fretting hand. For this watch the video below and use this music. gallery/james bond.pdf . You will also need to start reading tab. This will give you a starter. http://www.wikihow.com/Read-Guitar-Tabs