You may want to begin your project by sketching and paper prototyping your plan. "Paper prototyping" lets you use paper cut-outs to create a quick and inexpensive model of whatever you want to design or build. You can see which parts fit together and which might need to be repositioned or changed before you make your "final" project. You can paper prototype a web page or screen of a video game, as well as 3D models of things you want to build. See an example of paper prototyping here!
Younger makers: Make sure you get adult help with all cutting tools.
Photo credit: "The great hamster maze" by rahims.