Here are some links to useful and essential accessories, gear and books to help guide you on your way to further your enjoyment and progress in mastering the guitar.
Books.
The Guitarists Way series is a great introduction for the younger player into the world of reading music. (Adults can find it useful too !)
http://www.dsmusic.com/product/005791L/The+Guitarist%27s+Way+Book+1
http://www.dsmusic.com/product/0057923/The+Guitarist%27s+Way+Book+2
http://www.dsmusic.com/product/005793A/The+Guitarist%27s+Way+Book+3
http://www.dsmusic.com/product/005794G/The+Guitarist%27s+Way+Book+4
Time Pieces for guitar Volumes 1 and 2 are essential books if studying or about to start studying for your ABRSM grades on guitar.
Volume 1.
http://www.dsmusic.com/product/9781860967405/Time+Pieces+for+Guitar+-+Volume+1+%28Grades+1+%2B+2%29
Volume 2.
http://www.dsmusic.com/product/9781860967412/Time+Pieces+for+Guitar+-+Volume+2
Tuners.
The most important of all accessories! An in tune guitar is a happy guitar, and also critical for training your ears to hear when you go out of tune.
http://www.dsmusic.com/category/Guitar/Guitar+Accessories/Guitar+Tuners
Strings.
Your strings won’t last forever.
http://www.dsmusic.com/category/Guitar/Guitar+Accessories/Guitar+Strings
Guitars.
Children and small hands.
http://www.dsmusic.com/category/Guitar/Guitars/Kids+Guitars
Adults
Acoustic guitars
http://www.dsmusic.com/category/Guitar/Guitars/Acoustic+Guitars
Electric Guitars
Telecaster (one of my favourite guitars)
http://www.dsmusic.com/product/011-3202-703/Fender+American+Standard+Telecaster+-+Maple+Fretboard+-+2-Color+Sunburst
Stratocaster
Amps.
http://www.dsmusic.com/category/Guitar/Guitar+Accessories/Guitar+Amps
Recording Software (DAW – Digital Audio Workstation)
Protools.
http://www.dsmusic.com/category/Tech/Pro+Tools/Pro+Tools+Student+%2B+Teacher