400 $ ?
u have been working as a teacher for 13 yrs , u shouldnt accept such small amount .
u wont be able to bring ur family , and u wont be able to send them money or save any .
even if they pay ur accomodation which might be a bed space only . this amount is very low here in Qatar .

what about transportation ? medical insurrance ? mobile ? food ? etc ...
either u stay in ur country or u find a better offer .

good luck