Pay is here
http://www.legion-recrute.com/en/salaires.php?SM=0
RE = Basic training
REI = Infantry
REP = Parachaute Regiment
DBLE = Demi Brigade of Mechanized Infantry
There is also Engineer (REG) Cavalry/light Armor) (REC) and Recruitment (DGEM) I couldnt find pay scales for these but expect it to be more the less the same on average.
There is various bonus pay not included on the chart that you may receive.
Advancement in the Legion is strictly based on merit.
The Ratio is 25% of legionnaires become NCOs, 10% of NCOs become officers.
All NCOs start off as simple legionnaires, you need the following minimum level as a soldier before becoming a NCO
Corporal -2 years
Senior Corporal -6 years
Sergent (you have served a minimum of 3 as a corporal or senior corporal)
Senior Sergent (minimum 3 years minimum as a sergent)
Adjutant (minimum 3 years as a Senior Sergent)
Senior Adjutant (minimum 3 years as a Adjutant)
Major (upon reaching Senior Adjutant, but you must pass exam selection)
So if you were an absolute racehorse you could go from Legionnaire to Major in 14 years, but I seriously doubt this happens often. Most majors have between 14-25 years experance.
Major is the highest rank in the legion, they report to Regular French Army Staff officers.
Benefits -45 days annual leave. There are other benefits but you best talk to a recruiter.
One retirement thing that is kinda unique, is the Legion actually operates its own vineyard in Provence. The entire farm is run by elderly retired legionnaires (usually those that have no family). The wine is called Esprit de Corps (Code of Honor) and can be purchased online.
FFL Vineyards.
http://www.wineterroirs.com/2008/09/legion_wine.html