What to do after a job offer

felicitations monsieur je veux y aller mais j'ai pas trouvé du boulot pour l'instant...

Hi Lubaptista!

As this is the anglophone forum could you please post in English?

Thanks
Armand

Lubatista,
Sorry for hearing that, but keep applying, who knows.

yes, I need to keep trying ....
thanks Armand!
thanks pirlo59 ..

regards
Luisa

Otherwise , anyone to tell how long it takes to have the work visa?

Depending on the employer's initiative and how active their Government relations department is, the visa can be done from just one day, to any number of days.  On average you should expect 2 weeks. After the work visa is issued you can come into UAE, then do the medical exam with which you would get residence visa stamped.  Residence Visa may get a bit delayed as it now involves getting the Emirates ID also.
In any case, as a French national you can visit anytime even without the visa, then they can always issue an employment visa here.  All depends on the employer...

I asked the HR, they said that the offer letter is legaly enough and the contract will be signed when i come to dubai, so i can resign from my current employer,
is that true?