How to download data without prior knowledge of Could Computing?

Dear community,

after having successfully applied to ICGC data protal, I feel a bit lost about accessing controlled data as I have no prior experience and knowledge in cloud computing. I tried to use Amazon AWS EC2 with several tutorials but I was not able to download any data.
Does anyone has an idea how to get into cloud computing for beginners. I really would love to use ICGC data but Iam really sad that I am not able to download them… Does anyone offer tutorials or private tutions?