You will find that students are by nature curious about everything. I have a stool in front of my desk and to spark curiosity in science, I will find an item that is used to introduce a science we will be studying to place on it. As my students arrive, they seem to always gravitate to the stool and begin asking questions. I tell them to get their science notebooks and record the questions they have because they are great questions (and I won't answer them!). This sparks their enthusiasm for science.
Another tactic is for your students to bring in phenomena they have observed. Then begin a science phenomena corner! You will have an amazing collection. Even my parents bring things in! Rocks, bark, fur, antlers, bones, and a bat are a few in my collection!
Have fun! You will learn so much from your students!