To get to Aleroth, you need to find at least one of each of the 3 types of zeppelin parts (there are 9 parts total, 3 of each) in the fjords and talk to the zeppelin master on top of the harbour building. After that, talk to Sepp on the ramp up to the zeppelin.
In Aleroth, head to the end and use the teleporter shrine (talk to the leader on the nearby steps) to get in to the ministry. Agreeing to help Zandalor seal some rifts will get you the shield you need to enter the Hall of Echoes. You don't actually need the shield until near the end of the game, but there are a couple good merchants in Aleroth, so it doesn't hurt to go there early.
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