From the spawn to get the stronghold, you need find the well. Then jump to it, after reach to the bottom of the well dig straight down. In the stronghold you will find a dungeon with a mob spawner (zombie spawner) and a lots of mushrooms. You can find the end portal after finding the library because both of them very close with the other.
Back surface of the seed, the spawner is a village located in the landscape with half of desert biome and half plains biome. Enjoy!