Just an introduction to the story.
Note: This timeline is not canonical; I made changes to the ages of characters for story organization when I couldn't find anything more detailed about Konoha and its history, so I created my own timeline.
YEAR ZERO - Madara and Hashirama create Konoha.
Year 2 - Tsunade is born.
Year 5 - Madara fights Hashirama at the Valley of the End.
Year 5 - Mito becomes the Kyuubi's jinchuuriki.
Year 5 - Tobirama takes on his disciples, who are Danzō Shimura, Kagami Uchiha, Torifu Akimichi, Homura Mitokado, Hiruzen Sarutobi, and Koharu Utatane.
Year 5 - Hashirama distributes the bijus.
Year 6 - Tobirama becomes Hokage.
Year 9 - Hashirama dies of an illness.
Year 10 - First ninja war.
Year 15 - Hiruzen takes on his disciples: Tsunade, Jiraiya, and Orochimaru. (They graduated at the age of 13 because the First and Second Hokages didn't want to send children to war.)
Year 20 - Tobirama dies, Sandaime Hokage takes charge of Konoha.
Year 20 - End of the first ninja war.
Year 26 - Tsuna Senju (Tsunade and Dan's daughter) is born.
Year 30 - Minato comes to Konoha as an orphan.
Year 32 - Minato receives his transmigration. (Minato at 6 years old, Senju Tsuna at 6 years old, Uchiha Mikoto at 6 years old, Uzumaki Kushina at 5 years old)
Year 32 - Start of the Ninja Academy (Minato at 6 years old)