May your guitar stay tuned, your fingers develop callouses, and may you finally learn how to play!
So now that you have gone out and bought your first guitar (or fifth if you're like me) you need to know how to properly maintain it. This is a colloection of what I have learned from my grandpa, what I have figured out myself, and what I have seen online.
Step 1: The First Clean Up
If you bought your guitar new or used, you are going to want to do this first. These next few steps will make your guitar look better, feel better, and play better.
Step 2: Remove The Strings
The first thing that you should do as soon as you get home is change out the strings on your guitar. Most guitars that you can buy at stores come pre-strung, or with strings. Buy a good set of strings, as the pre packaged sets are never good sounding. A string unwinder is good for this task, but it is not necessary. Unwind the tuning peg until the string is very loose. Take the string out of the tuning machine's top part. Then pull the string out of the bridge, completely removing it from the guitar. Set it aside for now (if you plan on using it in a later project), or throw it away. Do this for all six of the strings. Be careful not to let the strings slide over the guitar's finish, as it may scrach the guitar. The pictures below are of my Fender Squier Affinity Series Telecaster and my Grenada that was given to me by my uncle before he passed away. To take the string off of an acoustic guitar with the pegs in the bridge, loosen the string, then remove it from the tuning machine. Pull out the peg with piers, but be gentle. The pegs dent very easily. Some of guitars with these pegs have pegs that are easy to pull out, so you can just do it with your hand.