The Lost Mine of Phandelver is an adventure for four to five 1st Level characters (though it can be played with fewer people.) You can find everything you need to play this in the Starter Set, including the adventure book, the Starter Rulebook and five premade character sheets as a sample guide. During the adventure, your characters should advance to Level 5. The adventure is set a short distance from the city of Neverwinter in the Sword Coast region of the Forgotten Realms setting. You can find a copy to read The Lost Mine of Phandelver's Rule Book for free here.