Hi. Congratulations on the job! Sounds like a wonderful opportunity for you

I just left a reading teacher position in order to teach first grade. I have many ideas for you and would be happy to share. I can't PM because I am too new, but if you have questions please post and I will try to check back tomorrow evening.
Just a few quick thoughts...
1. Organie books using the Fountas and Pinnell Guided Reading Levels -they are so popular and there are so many books out there already leveled for you.
2. Bulletin Board Idea: Something with Comprehension, maybe the key areas (questioning, visulizing, etc.); definitely a word wall, something fun based on a favorite book or a place where students can put up their own reviews.
3. I think Daily 5(or daily 2-3) would be best for you in order to accomodate the many needs and levels. the only downfall is that it takes ALOT of modeling and time to setup, not sure you are able to devote that might time to it, but if you can it will be very worthwhile
4. Assessments: I would assess using the Fountas and Pinnell Benchmark Assessment Kit if you have one available. It's very comprehensive and can give you so much information, plus it will help you allign your students to the book levels. I'm not familiar with the QRI, but if it's like the BRI-it may be too time consuming. The F&P kit is time consuming too just not as much.
-You should also use the Words Their Way Spelling Inventory. This can help you determine the types of sorts students can work on during Word Work and it is another assessment method for you in terms of spelling stage development.
-Once you have reading levels determined and books to match those levels, you can use running records to assess your students as frequently as needed. You could adjust their books choices at that time. You could create a graph in word or excel to track their improvement.
5. Comprehension- There is a great site I found hyears ago called "Into the Book." I haven;t used it in a long time since I've been working primarily with young students. If you do a google search it should come up. If it's there then it could be a great way to incorporate technology into your instruction and student activities.
Sorry my battery is about to die, but I will post more if something comes to me. if you have questions please post and I'll try to answer tomorrow. Night!