The Students of the World website provides forums where people can interact. Use these forums to create a good feeling with possible penpals. Respond to people's questions, offer sympathy and (sometimes) talk about yourself.
1) Here is are some discussions from a forum about dolphins, for example:
Michelle says that she "has loved dolphins ever since [she] saw one at a water park." Rebekah answers that she has just finished reading a book about dolphins (people can ask her about the name of the book). She says that they remind her of people and asks Michelle what they remind her of. Maybe you can add your own opinion here.
2) Nova, who is from Bangladesh, say that she has eight dolphins! Her English is not perfect (she doesn't use plurals and her sentences are very short), but that's OK. Nobody criticizes her English (you don't need to worry, either: just say interesting things). Kamen, from China, says that she is lucky, and asks her two excellent questions. Rachael and Ge Wenfan say something a little boring.

