Keep learning SICP. Just reference other books or online sources when you need to know more about something it's talking about. Also get a good book on Linux to help you get used to that. I reccomend A Practical Guide to Linux: Commands, Editors and Shell Programming by Mark G. Sobell. It's quite a tome and not a book you read cover to cover (unless you want...it would be good to do so, just not really intended to be read that way as it's dry) but it will teach you the ins and outs of Linux in ways a gay JooTube video or some blog post can't.