To make sure your new friends understand you, you should practice Practice your Pronunciation; to understand them you should Improve your Listening.
Other fun and easy speaking activities are: describing what you are doing ("I'm walking in the park") or thinking ("Shall I call her?"); a picture dictation with a friend (describe a picture to your friend, (s)draws it); giving a running commentary on a film (movie) ("He jumps into the river, swims to the other side".); and re-telling the story of a film in your own words.
