Leveling by grinding on mobs can be a great chore but leveling in WvW doesn’t really feel like ‘leveling’ you’re just having fun and engaging in PvP. It’s just a bonus that you gain experience too.
You might think going into a WvW against the level 80 people would-be suicide but WvW simply dynamically adjust a player’s level to level 80, similar to how the dynamic leveling system will scale a player’s level down to an area’s maximum level plus one.
Equipment, traits, skills, and everything else follows along. So a level one player will simply be a level one player with the effective stats of a level eighty player. It’s advised that you at least progress to level 10 traditionally, as even with the level 80 attributes you’ll still need your skills.
This gives all players the chance to contribute to the greater good of their world. This also means that, after a short introductory tutorial, you can hop right into WvW and begin leveling.
In WvW, you get experience for killing other players, capturing control points, defending control points, for any NPCs that you kill, and any other general activity that would normally grant experience.
Therefore, the best experience will come from being with a group of players who are aiming at taking objectives (keeps, towers, resource camps), doing PvE objectives (bringing mercenaries under control), taking down supply dolyaks, and the random sentries throughout the land. The faster these control points are flipped, the quicker the experience comes in.
Keep in mind not to waste time doing things that aren’t going anywhere. You might spend four hours participating in assaulting that keep and finally taking it over. However, you could have just as easily taken over undefended supply camps, towers or slain Dolyaks for more experience and useful contribution to the Battle in general.