1 - Is this salary worth joining ? - Ask yourself.

2 - Will it be sufficient for me and my wife ? - Ask yourself again. it depends on ur lifestyle. i know of people who live a good life with 7K.

3 - Does Salary plays a big role in getting a family visit visa for my Wife ? Will i have better chances ? - All the govet needs it to be is 7.5k. They dont care if it is 20000 or 200000

4 - Can i call my wife on Family visit visa after getting my first salary ? - yes

5 - Company is also giving me 20k advance for furniture allowance.. Will this be sufficient to buy the house hold furniture and other things for household purpose like utensils etc - Again depends on what you buy. For most cases, its a yes.