Hi Amit,
I am surprise that you'd be offered that kind of position immediately. Do thread the water carefully with respect to this opportunity. It does sound a little dodgy to me. Besides I don't even want to question why you are going to that level given that you have an engineering degree.
Anyhow, if indeed what that agent you deal with said is true, then here are my response to your questions.
1) Is 6100 Ca$ a good salary to live in Toronto suburbs. (Includes everything)
I think it should be fine. Its not fantastic but its livable at somewhat comfortable level. The only thing is that you'd have to be careful to the nature of your job. How many hours are required to work. And if you send your kid to day care - note its not cheap and that daycares tend to charge more after they close. That won't be good for you if you work long hours.
2) Looking at health and son's education will be bear by me as I am not a PR holder can I able to save a minimum 1500 Ca$ per month.
If you have work permit healthcare (OHIP) should be free. But drugs (medicine) isn't. Unless your employer covers your drug plan for you and your family.
3) Apart from above my major concern is, We will enter Canada in temporary ''UNSKILLED WORK PERMIT'' for 2 years. Shall we eligible to convert it to "SKILLED WORK PERMIT'' if i got a chance to work professionally with some other employers.
when you come to Canada with a work permit - typically it will be a closed work permit. This means your permit is tied to the employer. Should you leave the company or be fired, your work permit is no longer valid. If your spouse's work permit is tied to yours, then when that happens to you - then hers too will be invalid.
4) Will we be eligible for PR after 2 years if we worked in Unskilled Work permit.
Errmm.. no. Doesn't work that way. Your agents should be able to advice on this. Its going to get very lengthy to explain it here and I rather not go into the details.
5) Is IELTS is required after 2 years for PR. (Got some info in internet that doing a french course can opt out the option for IELTS)
Yes IELTS is required for PR application. You can't opt out of IELTS just by going for french course. You could however not go for IELTS if you sat for the French equivalent of IELTS. That unfortunately I don't know what it is. You can find it out online.
6) Rather than the said job Can I work other part time jobs in the leisure time.
Technically you are not suppose to.... period...
7) Within 20 to 25 kms from GTA area can i find a 1 bedroom flat or basement within the cost of 700 to 800 Ca$
I am not sure. Use kijiji.ca to find out and get a gauge. Obviously the cheaper it is, chances are the smaller the lodging and perhaps even move ghetto the place. That's always the rule of thumb.
8)What is cost of education for kids.
If you are going to a public school it should be free. However you can only send your kid to schools that are located close to your home address. So choosing the place you live is important as that determines the type of school your kid goes to.