If you wanted to go to a specific team at a specific stadium, you need to say that from the beginning.

e-tix only has contracts from some 5-10 sports teams; the Tigers aren't one of them. There is no way to buy Tigers tickets directly in English and with an overseas address. You'll need to go through a broker like japanball.com, arrange to have the concierge at your hotel get it for you, or wait till you get to Japan and have the tourist office do it for you.

There are ways to get the tickets over the internet or on the ground, but they all involve knowledge of Japanese. Be warned that on certain days, such as games at Koshien against the Giants, all tickets are sold out way in advance.