Feel free to experiment. It is your journal. Your thinking is invisible, intangible, and internal. Journal writing brings your thinking into the tangible world. Let me assure you, though, that a journal is beneficial from the first entry.
Journals encourage wonder and curiosity.
When you write about anything for an extended period of time, you begin to see new things in new ways. Try writing about your location for a bit. Questions lead to more questions, which will spur your journal. Over time, inquisitive, individual thought becomes more natural. Journals help you work out confusing issues and deal with emotion.