Sector 9

The heaviest sector of all - you might even want to do several easier adventures like Horseback to gain enough experience to reach level 36 so you can start with crossbows.

OK now you've cleared your homezone fully the only way of getting new experience is doing adventures and every now and then an accidental quest from the book.

The easiest adventures to start with are: Horseback, Witch of the Swamp & Traitors.
Other interesting adventures are: Stealing from the Rich, The Dark Priests & Island of the Pirates.

Home Isle:

Sector 7 - Sector 8 - Sector 9

Sector 4 - Sector 5 - Sector 6

Sector 1 - Sector 2 - Sector 3