I couldn't agree more with Pedro.
You're essentially asking us to type out how to do an entire case! Unfortunately, this isn't going to happen in a Q&A. However, I can recommend any of the following:
1) Purchase a casing package (such as the one Preplounge offers)
2) Get casing right now with other beginners. They can help you learn
3) Hire a coach. They are your best time lever and can get you jumpstarted quickly (for example, I have a "Casing Template" video that takes you through an entire case end-to-end and shows you not only how to setup your sheet of paper but also how to think about the case....this is exactly what you're asking for!)