How do you start knights of the nine in elder scrolls oblivion game of the year edition

There is no main quest for KotN. Instead multiple quests are added that require you to do a variety of things. From finding relics and armour to killing specific NPC's. The quests are: Pilgrimage: Complete the Pilgrimage of the Nine Divines to show that you are worthy. The Shrine of the Crusader: Retrieve the Helm of the Crusader from Pelinal's lost shrine. Priory of the Nine: Retrieve the Cuirass of the Crusader from the Priory of the Nine. The following four quests must be completed before Priory of the Nine is considered complete. Nature's Fury: Retrieve the Boots of the Crusader from the Shrine of Kynareth. The Path of the Righteous: Retrieve the Mace of Zenithar from the Chapel of Zenithar in Leyawiin. Wisdom of the Ages: Retrieve the Shield of the Crusader from Fort Bulwark. Stendarr's Mercy: Retrieve the Gauntlets of the Crusader from the Chapel of Stendarr in Chorrol. The Faithful Squire: Retrieve the Greaves of the Crusader from Lathon. The Sword of the Crusader: Retrieve the Sword of the Crusader and reconsecrate it. The Blessing of Talos: Obtain the ninth relic: The Blessing of Talos. Umaril the Unfeathered: Defeat Umaril and kill him for good, in both the physical and spiritual planes. Here's an outline of one to get you started: (Pilgramage) Ask any NPC about "Rumors" and you may learn about the attack on the Chapel of Dibella in Anvil. You may also notice a new dialogue option regarding some sort of "Prophet". Asking about him will yield information about a man in Anvil who preaches that the attack on the Anvil Chapel is merely a sign of things to come. Asking about either of these options, or traveling to Anvil and speaking to the Prophet directly will add this quest to your log (the first of many). Additionally, talking to any citizen in Anvil will give you more information about the attack. The Prophet can be found across the road from the Chapel of Anvil, in the garden next to Benirus Manor. During the day, he is loudly ranting about the attack on the chapel, saying a threat has emerged from the darkness of the ages of myth to challenge Cyrodiil. At night, he sleeps in a bedroll in the garden; you can wake him up to talk with him. Speak to him about the Anvil chapel attack and he cryptically explains that a figure dubbed Umaril the Unfeathered is behind this plot, and that the only way to stop him is to use the Relics of the Divine Crusader, Pelinal Whitestrake. He then asks if you are a worthy knight. Depending on your ranking in various factions, you are given many options to respond. If you choose any "yes" answer, citing your accomplishments, he dismisses you, saying that you obviously do not need his help. However, the only way to progress forward in the quest is to seek the Prophet's help and choose any "no" answer, and then "How can I find the relics?". The Prophet explains that you must complete the pilgrimage of the Wayshrines of the Nine Divines to prove yourself and repent for your past misdeeds, and gives you a Map detailing the locations of some of their respective Wayshrines.You must visit and activate one of each of the Wayshrines of each of the Nine Divines. This is the first quest I would advise to do as it it the intro into the Knights of the Nine. Hope this helps.