As you learn about various cultures and evangelism tools and techniques you'll be able to practice them before you can use them. On Sundays you'll be able to attend services at and interact with a community of Spanish-speaking believers.
There is loads of time to be able to prepare for kids club days too. Whether you're teaching a story using a sketch board or teaching a memory verse, you'll be able to draw up, practice, and get things ready for the kids. It might be your first time doing this, so don't worry if it's not perfect.
During your time participating in STEP could also mean a future of evangelistic ministry, making these two weeks a perfect time to practice what is learned in preparation for the future.