Everyone was a total novice once, nothing to be sorry for. It actually has benefits for this adventure of yours.
The stabilizer screws into a hole that's provided for it in the front of the bow, just below the grip. If you can work an adjustable wrench ("spanner"), you can install a stabilizier. The sight attaches to two holes that are pre-drilled into the side of the bow riser (the part you grab onto): usually they take hex key wrenches (sometimes called Allen wrenches) and you can get a handy little set of those that folds up and stores inside your bow case. There's no optional location for the sight, you just turn the bow onto it's side, look at the two small holes which are located about 3" above the grip and say "I reckon that's where the sight attaches". The arrow rest is just as easy.

Bow tuning for a novice, with a novice bow, doesn't require much more than adjusting the sights. The finer points of tuning: worry about those as you gain confidence and experience. Adjusting the sight pins is not complicated, and it's another place where you need that Allen wrench set.

Hope this helps a bit!