For me, the curriculum started this spring wasn't actually "new" since I'd already been teaching 5th and 6th grade almost every week. However, elementary school lessons are yet another ESID situation. One of my schools prepares lessons for me, occasionally taking ideas from Eigo Note, and I'll just follow their instructions once I get there. My other school leaves lesson planing entirely up to me, but it's expected that I will follow Eigo Note for the most part.
If your school uses Eigo Note, then I highly recommend checking out this blog: http://www.eigonoteblog.com/
If they don't, then I'd ask them what sort of topics they'd like you to teach and go from there. Try to get the homeroom teachers involved as much as possible if you can. If you need materials, some of the worksheets and flashcards from this website might be helpful: http://hapilab.obunsha.co.jp/material/index.html