Biggest tip I can give, don't beat the Wall of Flesh until you are really prepared, the boss isn't that bad but it activates hard mode when you beat it, so you might regret it if you havn't gotten prepared for hardmode yet.
Oh yea, and one of those preparations includes making a thick wall around the Corruption or Crimson biomes, because they will start spreading in hardmode.
watch a playthrough of someone beating the game start to finish so u know the order of stuff like what bosses
guide can tell you how to craft stuff. i still use it and i play a ton
terraria wiki on hotbar of google