[?]: PLC interface with PC with Internet

[yeu1phut]

Name the topic: Setting up network communications system for the Internet and Fms FACT
I do not understand many of the following
1.Thiet network to download the program from computer to PLC. (Setting hardware and communication and Pc plc)
2.Thiet up network communications between the PLC station.
How to report hardware and internet communication with other than the normal network, this makes me difficult, you look forward to those who have experience only with help, because I just learn plc 1 week ago first month and work with PLC.
Expect very specific instructions how to report, hardware configurations, and similar documents please send me!
Thank you very much!