New buisiness

Cuenca has a large expat community mostly North American so knowing English will be helpful.
Ecuador in general wants pensioners that do not compete for jobs with Ecuadorians.
Most of the expats are aged 60+ with pensioner visas.
Restaurants are always a risky business.
I doubt that there is a Lebanese community at all.
I estimate the cost of living for a family in Cuenca at between $1500 to $2000USD per month
Question #8 I think you mean schools. Yes there are international schools but they are expensive

Samer604 wrote:

5- Learning Spanish is dificult? Can we learn it during a year fluently?

How people learn new things is something that has always intrigued me.

The direct answer to your two questions is, who knows?  You'll just have to try.

If you already know more than one language (and I'm pretty sure you do), it will probably be easier to pick up Spanish than if you have only spoken your mother tongue your whole life.   

Different people have different language abilities.  Generally learning a new language as an adult is harder than learning it as a child.  But a year of intensive exposure should be enough to enable you to function in the society without too much difficulty, yes, especially if you have fun learning it rather than seeing it as a task.

On a scale of language difficulty, I think Spanish would rank as one of the easier ones to learn, at least for an English speaker.  I mean, it can't be that hard, even the little children in Ecuador speak it!

So it is the same family of languages as French which you said you know. Some think it's easier