If you're serious about learning guitar this equipment is essential.
I use all of these products in my teaching studio.
If you can see your guitar you'll play it more. Buy a stand (like the Universal Acoustic + Electric Guitar Stand) and stop keeping your guitar in a bag. It's a fact that guitars look awesome in any room of the house.
There's nothing worse than playing an out of tune guitar. As a beginner using an electronic guitar tuner will save you a lot of time. I use the Korg GA-1. It's a great tuner that literally gives you the "green light" when your strings are in tune.
Learning to keep time with a metronome is overlooked by most beginners. Keeping a steady beat is essential if you want to be a good guitarist. The Korg MA-1 is a multi-function compact metronome. The "click" sound isn't too piercing and I find it easy to keep time with.
Have you ever noticed how you might raise your right leg (or stand on your tips toes) when you're playing guitar? You do this to bring the guitar closer to your hands and straighten your back. Use a foot stool instead. They're inexpensive and they'll make playing guitar more comfortable.
Over half of the lessons on this site require a capo. It's a small metal clamp that fits over the strings. They're inexpensive and essential for singing guitarists. I use Shubb Capos.
Over time your strings will lose their new sound. This means your guitar will sound dull and the strings will feel brittle under your fingers. I recommend changing your strings once every 3 months. I use Martin Bronze Acoustic Guitar Strings - Light (12 gauge)
As picks are inexpensive my advice is to buy a bag of different thickness's. As a beginner you should be using a thin pick (between 0.20mm to 0.50mm) However, as you gain experience you should increase the thickness.
I buy 3 bags of the Tortex picks pictured above at the start of the year, and they're normally all gone by the end!
While not essential, this can save you from neck pain.
When you're learning a song, you spend a lot of time looking at your hands, the last thing you want to do is look away from them to read music. I use orchestral music stands