I need HELP!!!

OK Teachers I need HELP!!! I am looking around at everyones blogs about how they are setting up their classrooms and I am starting to FREAK out about how to organize my library, I have several different types of books ranging from picture books to 4-5th grade leveled books! Is there any specific way that you organize your classroom libraries? Is there an app for that?!?! I am wanting to start working in my classroom a little bit after I get out of class each day, or if I can possibly get there before my class starts then come back!?!? I just don't know, I made a comment last night to my husband while laying in bed thinking about the TWO page TO-DO list that I created for myself that I only had 30 days before school started and I had so much to get done and his comment was is sure must be nice to still have 30 days off and be getting paid!! Really!! I was trying to say I needed to get so much accomplished in those short 30 days... AND I keep adding more and more to my list! I have a few things knocked off but the closer the start of the school year approaches the more scared I am getting!!! Why did I decide to start Grad school THIS summer, I could be working in my room everyday for hours and hours and getting everything that I needed done!! Oh well I didn't I will just have to deal!

SO thanks for reading my ramblings, but seriously can you help me with how to organize my library?!?! Keep in mind I am teaching 2nd grade this year but have all levels of books, is there an app or something that can help me either level my books or organize them?! Thanks so much for your input!!