This is more my hope than opinion; it is my hope that what is most surely going to happen over the next couple of months, specifically the death of the tree, will not dissuade you from continuing in the art of bonsai. Most of these super market bonsai are not cultivated with a long term goal in mind past selling the tree and getting the money. I realize this is kind of a cynical outlook, but after fifty years growing bonsai and seeing how bonsai are grown professionally as opposed to commercially, I have a real good guess this little guy is headed to the compost heap. Nothing would make me happier than to be wrong and that your care would be enough to bring the tree through.
Mike is right you need to check if the rocks and moss are glued on the surface and they need to be removed. The rock and moss can be replaced later once the tree is strong and growing. As to the tree; it is a Japanese Garden Juniper aka a Procumbens Juniper. It will need a lot of training with wire and pruning and a lot of growing out, something that is going to be very difficult with it growing in a bonsai pot with a rock and fisherman. This tree has no branching at all and will need to be encouraged to branch out. The tree has no design other than it goes over to the right with it's one branch.
If you are serious about getting into bonsai you need to work on keeping the tree alive and branching out.You need to work on educating yourself about bonsai and how they are made and how they are kept alive.
Oops! I was wrong! There is another branch hiding behind the first one. Now there is opportunity to do something with the tree but without the skill or knowledge to do those things odds are the branch would be broken. Can you photograph the tree from the other three angles and post those photos?
A word of warning: Procumbens Juniper have very fragile joints, the places where branches meat the trunk or large branches. If the tree is not handled carefully they break off at those points. Be careful if you start moveing the branches aside to get a better look.