PvP works differently from PvE and WvW
By default, there is no keybind for the PvP Build menu. You may find it useful to bind one, to access the menu more easily.
In PvP, you get your stats from predefined amulets, in the case of runes you can select one full set - no mix and matching. Sigils also function differently. PvP has its own set of sigils, for instance whilst there isn't a Sigil of Force, there is a Sigil of Exploitation, which has a similar effect but requires the target be below 50% health. This system allows for greater balance, even if it is somewhat more confusing to newer players.
The stats on your armour do not matter. However, it is important that you wear a chestpiece, leggings and boots. You lose armour stats if you do not wear them. Thankfully however, even on a Level 1 character, you will have these pieces of armour so you can jump straight into PvP from character creation.
The below video shows how to get started making builds in PvP.
Using Build Template Codes
Build Template Codes don't store information about amulets, runes and sigils. Make sure you set those up before you queue!
Edited by Angeels