How much annual bonus promised ?

if you are on secondment, they should support you with your initital expenses as well as your cover your flights, medical and schooling.

your main monthly expenses will be:

accomodation: 8K 3BR/ fully furnsihed apt
transportatio: 2K to 4K; get a 4x4 on lease or rent
food/utlities: 2K to 4K; it all depends on ur lifestyle
childern education: an X amount/year

medical/flights/annual bonus should be covered by the firm.

I personally believe 25K is pretty decent salary, and you'll do just fine in Doha.

its not like, they'll rob you out of your salary.
believe me you'll be able to save above 8K/month.

btw i dnt know about your experience and nationality .. based on which you could exercise your right of re-negotiation.

however, contentment and satisfaction lies all in oneself and not around anywhere.