1] Will it be enough for living in qatar. How much can be saved. 13000 depends upon ur life style when u plan to save u have to be little kanjus as doha is become quite expensive
2] What are normal monthly rent for 1 or 2 BHK appartment:5000 to 6000
3] Is it difficult to get Qatar driving licence. yes but not as diffcult as in dubai
4] If my wife come with me there, can she work in doha.Yes he can work but she has to first get a job after coming here . need a sponser as on residence permit she is not authorized to work.
5] Is there any public transport available: Karwa Taxis and Busses but facilties not so good so better buy a second hand car or u can avail private transportation to and fro to office: 800 QR.
6] Can we get Indian grosseries & foods easily: Yes supermarket and small groceries like FFC, Dasman , lulu Hyper etc

http://www.qatarliving.com/node/124959 chk this link for more details