Check out jeconreports; on their sidebar, they have useful tutorials regarding JE concerts and explanations of how the ticketing system works. If you're outside Japan, your options are extremely limited and almost inevitably very expensive: if you're not in the fanclub, you'll almost inevitably have to pay a fortune, and you cannot join the fanclub if you're not living in Japan.

I bought my ticket from . If you get tickets through the fanclub they're 6800 yen, but mine cost me 20000 yen and I was actually lucky to be as close as I was for that price. On that site and on Yahoo!Auctions, tickets for really amazing seats (in the arena or in the stands right next to hanamichi) will routinely go for 85000 to 120000 yen.