xbilz,
Be realistic with your choices. 3 to 4 weeks from nothing to PPL is very optamistic, also considering you have not done the theory.
However to go for a JAA CPL you only need an ICAO PPL, but remember you also need 5 hours night. The FAA PPL gives night instruction/rating as a matter of licence issue, but look at the others. If you got a CAA PPL you could then go for a night qualification and get the hours needed.
Remember it is not a straight line to the "job" there is a lot of hard study and aptitude needed along the way.
Also get a class 1 medical before shelling out a load of money on training. It might seem stupid, but if you are denied for any reason it will save you a fortune.
All the best mate and hope all goes your way.