The original intent was to do what John Carpenter had tried to do with Halloween III, and not make it a continuous story, but an anthology series with different movies tied to the Friday the 13th superstition. However, when the ending to the original movie was as well received as it was, they decided to continue the story centered around Jason. The story picks up two months after the events of the original film, with Alice trying to recover from her experience. Later, the film time-jumps five years to a new group of prospective camp counselors attending a school for camp counselors at a different camp near Crystal Lake, which has been shut down. From there, it becomes the typical slasher film that the series has become famous for.
There are a few different versions of the blu-ray disc out there. I have the Shout! Factory version, which is a single-disc release that can be purchased individually or as part of the complete collection box set. The A/V quality is very good. The audio includes a 2.0 channel track that may not work on some sound systems. It does, however, also include a 5.1 lossless audio track that should work with a surround system, but you may have to change the audio setting once the film starts playing to hear it, even if you select it from the disc's main menu. The extras may vary depending on which edition you get, but most will include an interview with the author of the book "Inside Crystal Lake Memories", the second chapter of the Lost Tales from Camp Blood short, and a featurette on one of the horror conventions. Mine also includes a podcast interview with Amy Steel, the theatrical trailer, radio spots, and a couple of different stills galleries.
The movie is very much a carbon copy of the first film. Most of the action happens in the second half, and the third act has the most going on. You pretty much know what you get with these films: the acting and writing will be okay, but not stellar; there will be some gratuitous nudity and a lot of violence. This version of Jason is definitely not who we get in later films when he is basically unstoppable and wears the hockey mask. Ultimately, if you like horror movies and you enjoyed the first film, you will probably like this one (even though there is not much new about this one other than who the killer is). It does, however, set up what will come in the later films, so it is worth watching.