I am also a future elementary school teacher and one of my favorite subjects is science! One of the things that I like best about it is the hands-on activities that the students can do! As an example, I have field experience with a thrid grade classroom right now. Within the past week, they have been learning about how seeds grow into plants such as fruits and vegetables as well as how animals assist in pollination! This unit is so easy to do experiments with because there are ample amount of resources to use, all you have to do is look! Just today, my students and I conducted an apple experiment during class. I gave them four different types of apples and they had to figure out the different tastes that the apples had as well as write down what the apple looks like. After when we were done I created a bar graph and my students had to state what apple was their favorite (little to their surprise they were doing math)! One way that I would recommend to learn with your students is to pick out activities and lessons that not only your students will enjoy, but yourself as well! I found out that it is a lot more enjoyable when you are able to positively experience science class with your students!
When in doubt, allow students to take control of their experiments and let them have fun! This allows them to explore and become more comfortable with their subjects.
Hope this helped! Happy sciencing!