1. Is it easy for newbie to setup ANTMINER machine and start earning bitcoins?
Yes, it is easy, plug it in, enter your minining pool details, and you are good to go.
2. What are the other things required for ANTMINER S7 to make it run smoothly?
You need a 1350W power supply and an internet connection.
3. How is the Life of ANTMINER S7? Can I expect it to be work for me for 4-5 years?
Probably not, its a very sensitive electronic item, with a warranty for 3 months, it can fail at any time.
4. How frequently it needs to be repaired?
You will mostly be needing replacements, rather than repairs.