SAP Beginner Questions? Can anyone help ?

I am thinking of making my career into SAP, please help.My questions are listed below ( Sorry in advance as i know these are very Basic Questions )

1) Where to start from

2) Do you have online documentation to learn

3) Which module should i select i am a network administrator

4) What is the normal $$ per hour rates for administrator ?

5) How much time it takes to completely learn the module ?

6) Is there any online certification for it ?