Welcome, Abo,
I have not started treatments yet, so as of now, the best advice I can give is to spend time reading as many of the posts on here that you can, even if it takes a few days to do it. You will learn so much, and as others have said, knowledge is power. You will also learn very quickly that you are not alone, and you will be able to take advantage of others experience and knowledge. To use only a few cliche's, Follow your gut, question authority, and take it one day at a time.