iirc in the Firelord place, go south first (after opening the chest by the firelord and before jumping down the hole). Open the door and you'll find 2 more amber pieces, giving you enough for everyone. After that I usually just do the holes from the main roon in clockwise order starting NEAs far as dungeons/overground maps go, in the last game I trained twice. Once from lvl 1 to lvl 15, once from lvl 15 to lvl 45. Cleared/did everything
At level 1:
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New Sorpigal
Ironfist
Goblinwatch
Abandoned Temple
Free Haven Sewers
Shadow Guild Hideout
Temple of Baa
At level 15:
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Bootleg Bay
Free Haven
Blackshire
Silver Cove
Frozen Highlands
Misty Islands
Eel Infested Waters
Dragoons Caverns
Corlagons Estate
Snergles Caverns
Silver Helm Outpost
Temple of the Moon
Tomb of Ethric the Mad
Dragoons Keep
Lair of the Wolf
Temple of the Snake (got Guinevere off the gold dragon there )
Monolith
Warlords Fortress (rather hard)
Silver Helm Stronghold
Icewind Keep
ShadowGuild
Castle Alamos (also rather hard)
At level 45:
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Everything else
--Chandor