I was sort of in the same boat as you. My company jumped into PLC's last year as an experiment. We began with the CompactLogix series of units. I volunteered because I was a technician at the time gunning for an engineering spot. I wound up completing the project and getting hired on as engineer. Now I've got like 3 more PLC projects lined up.
http://plcs.net/ has been the best resource for me as well as the various PDF's available from AB on the hardware you're using.
This book might be a good starter: http://www.amazon.com/Instant-PLC-Programming-RSLogix-5000/dp/1849698449/ref=sr_1_23?ie=UTF8&qid=1423082293&sr=8-23&keywords=allen+bradley
I gave it a 2 star rating because I'd messed with RSLogix before and knew most of the basics in that book. The overview implied a lot more depth than was actually provided. If you PM me your address, I'll ship it off to you for free.
Best of luck! It's a bit overwhelming at first, but once you get your hands on the software and get to start messing around with the logic, it starts making a lot more sense. If you have a mind for programming, you'll be fine :)