Autodesk Fusion360 Software
You will need a licenced copy of Autodesk Fusion360 software. This software is paid and costs $60/month, $495/year or $1,335/3 years. You can purchase the software using the link below:
https://www.autodesk.com/products/fusion-360/overview?term=1-YEAR
If you are a student, you may be eligible for the free education download of Fusion360. To check if you are eligible and to download the free copy, click on the link below:
https://www.autodesk.com/education/home
If you are part of a start up, you can apply to Autodesk to download Fusion360 for free for you team. Check out the link below to apply:
https://www.autodesk.com/products/fusion-360/startups
MacOS or Windows Machine
You will need a computer to download Fusion360 on. The software is available to download on both operating systems and the interface is same for both.
Method of Sketching iPad, Graphic Tablet, Pencil and Paper
You will need a way to sketch your ideas before creating your designs on Fusion360. While pencil and paper are completely fine, an iPad or graphic tablet would be recommended as creating advanced sketches is relatively easier on those.
If using an iPad or a graphic tablet, you will need a sketching software. Autodesk Sketchbook is my personal favourite and you can download it from the Autodesk website for free or from the App Store (iPad or Mac).