A Shell Pack usually includes only the bass drum and the toms. The snare drum, the stands, and the pedals are bought separately. Shell Packs are popular because most drummers have very specific preferences for the snare drum, pedals, and other hardware they use. Normally you get all the drums but you do not get any other stands and cymbals.
The term “Shell Pack” sounds like you are getting the shells not drums but it should include the drum shells, lugs, hoops, heads, legs etc..most have the hardware needed to mount the drums and a snare. Some do not.