Click on the green flag and then move the slider to alter the tree management. Click on the tree feller to request wood. Keep an eye out for natural disasters though - they’re very disruptive!
Thanks to Raspberry Pi Foundation, by letting me use their template to make this project and for telling me how to do this project, go on their website and check it out! Here is the link to their website: https://projects.raspberrypi.org/en/projects/tree-life-simulator/ :) :D