Thank you so much for those both constructive answers.

You're right, although I'm beginning I'll try both ways, I'll get back here if I've any problems about that.

Wow at first glance I must admit that it seems a bit hard to me as a beginner, I'll check it out tomorrow thank you for your answer.

Thank you for this very well explained answer and that useful link.

Sorry for the ambiguity, but unfortunately I'm also having problem with the import, in fact, it is my main...