I need help soft modding my Xbox 360

I am new to this whole modding thing, Ive never done it before so I am obviously a little nervous getting into this. Anyway, I noticed that a lot of YouTube videos have been made on the topic, but I cant find one posted within the past month. I am also unaware of what would constitute a good size flash drive for this project, so if anyone could help me out step by step that would be amazing.