Asiana Club - Lax-Pek in October

I need your advise on how to purchase a ticket in Asiana. Will I be able to find a better deal than in Asiana's webpage? How do I get to book a seat? Which seat would be best in J class?

I dont live in the U.S. and travel agents in my country are not familiar with Asiana.

Appreciate your help

Bea