Wanted!

Should you accept Sir Amik Varze's offer to become his squire at the beginning of the quest, simply speak to Sir Tiffy Cashien to continue on.
If you talk to Sir Amik Varze for the first time while wearing initiate armour, you will get an amusing little quip about how much you like the armour.
After finishing the quest you can buy White Armour from Sir Vyvin. You'll find Sir Vyvin on the 3rd floor of the White Knight's Castle, on the East side.
To get better weapons and armour you need to raise your White Knight rank by killing Black Knights. You will start at the Novice level. Killing White Knights will lower your rank. Your current rank can be seen in your in game quest journal.

Rank	Kills required	New shop items
Unranked	0-99	none
Novice	100	Chainbody, Platelegs
Peon	200	Dagger, Shortsword
Page	300	Med helm, Plateskirt, Sq Shield
Noble	500	Longsword, Mace, Magic staff
Adept	800	Boots, Full helm, Gloves, Kiteshield, Platebody
Master	1300	2h sword, Battleaxe, Claws, Halberd, Scimitar, Warhammer