You have many different choices when it comes to graphic design. You could design packaging labels of many food products. You could also be a web designer, you design websites like facebook, twitter, instagram and many more web sites. There are many more things you could do as a graphic designer.
The kinds of things you can do on the job. Depending on what your job is you have different responsibility . If you have a job for a soup company or if you work for a video game company.
There are many work conditions for graphic designers because it depends on what type of job you get. You could get a graphic design job where you can work from home or you could get a job where you work in a office building.
Also depending on where you work the environment there could be very loud with phones going off or the environment could be very quiet and there are one or two phones going off.
The training you will need is learning how to use the tools and equipment for the job. Also you need to continually improve your skills because you will do more than one style of graphic design.
You will have to go to school before you can get the job because you need a Bachelor's degree to become a graphic designer.