Welcome

Levelling here is really easy with the 15x experience rate, so you just need to enter a zone with monsters of your level or a little below and locate quests and complete them. Only a few would be needed as you gain like a level and a quarter per yellow quests(my assumption).
Gear while levelling is really hard to get. You'll almost never find any low level players to run a dungeon with you however you can get hold of any 60 player to boost you through dungeons for some gear. Hence, you mainly rely on any gear that drops off mobs. Everyone just levels to 60 with quite a lot of empty gear slots

Once you're level 60 you can join other players for 5man dungeons and when you're done getting some rare(blue) gear you can eventually start raiding with a PvE guild.
Hope i was of some use to you