The Hobby Shop appears on the map next to The Pet Shop on the same block as The Salon, and will only appear in the game once you have either leveled your town to the point that it will contain a related item for a profession, or reached the point where hobbies kick in.
In some versions of the game the Hobby Shop is renamed Promotions R' Us.
While it is called the Hobby Shop the bulk of the Items that are sold in it are actually used to level your Sim professions and not their hobbies. The exception to that is the Fashion Studio item.
Note: Every now and then free cross-promotion (advertising placement) Items can appear in the Hobby Shop - for instance at the time that this update was written the shop contained a free Toyota guitar. In addition to the Toyota Guitar in the Hobby Shop inventory, you can also add a free Toyota Amp in the in-game store.
The Hobby Shop presently offers the following Items for sale:
Note: The list above is subject to change based upon Game Updates.
What happens if you already have full levels on your jobs? Does it do anything and if not is there any point in buying it?
Yeah it actually is for a teenager
How do you level up faster
While teaching guitar is not (at least not yet) a hobby, playing most definately IS. Or rather it is part of the Teen Idle Missions, Quests, and Hobby.
Open your game and select the Careers and Hobbies pop-up menu (bottom right side of the screen) - select any Teen with a hobby to open the hobbies interface then use the tab to open the Teen Idol menu.
You will then note that among the instruments and requirements for that Hobby is Microphone (Singing), Keyboard, Guitar, Bass, and Drums.
Is teaching or playing guitar one of the hobbies ?