I am a complete newb!

I started my current job a year ago after being a mechanical design contactor for a few years. When I took this job they offered a nice salary, good benefits, etc.. Recently I’ve been informed that I should look into taking over the IT duties also. It’s a really small company with about 20 computers, two servers, some printers, two lasers and other networked pieces of manufacturing equipment. Right now the IT duties are farmed out to a local company that can be difficult at times.
Anyone have any recommendation for someone in my situation? Any books to read? Web sites to visit? A lot of what I read here about networks and network administration goes right over my head.