The typical sound of an electric guitar isn't that powerful without electric amplification. To achieve this certain sound you'll need a special guitar amplifier and appropriate equipment.
When you start with guitar playing a small training amplifier with a power of 10 Watts is more than enough. The amp should have a volume controller, sound equalization (bass, middle, treble) and a distortion switch with stepless adjustment. A built in tuner is an exception to the rule, but you should keep it on your list.
You need a cable to connect your electric guitar to the amplifier. Pay attention to the aperture, the length and the quality of the jacks. This is important for a good sound and long durability.
With the guitar strap you can put on your electronic guitar. That looks cool and is comfortable as well as practical. It should be adjustable in length but above all it should be long enough.
The plectrum (pick) is there for striking the strings. This impact causes a tone. In general a plectrum is made out of plastic and is available in different sizes and thicknesses. You'll have to try out which pick is suitable for you.
A electronic tuner helps you to find the right tuning effortlesly. The LED indicator always shows you the right tone pitch. Real good rehearsal amps are equipped with a built in tuner.
The gigbag in general is made out of Nylon and it should be well padded. Therefore the instrument is kept safe and easy to carry because of comfortable shoulder straps. Additional equipment can be stored inside appropriate outside pockets.
You'll need it at home, on stage or in the practice room - a solid guitar stand offers invalueable comfort and safety. This should be the place where your guitar waits for the next performance.