The process I do to level a toon to 470 is as followed.
First get your Azerite ability for your necklace.
Next Get your cloak (This brings your necklace to 50 if im not mistaken)
Next if you can have a group have them run you threw a world tour threw the mythic 0.
Now you should have a 430-445 Ilvl and lvl 55+ necklace and can start leveling your cloak SOLO till lvl 5.
Do both assaults in panda land and in Uldum for a chance at another free item. (Include the world boss that is up)
Now you can que for LFR and normal Raids and Mythic 10s. (Farm for your azerite abilities you require for your final builds)
After some M10s you should have 455-465 Ilvl
Que for Mythic/Heroic Raids and Higher keys.
Enjoy 470+