help...newbie for turtles..

[GreenDay]

hi, my name is kris from indonesia.
i recently given a pair of juvenille sea turtle,but i dont know what kind.
i know that they are endangered,and its ilegal to have one here in indonesia, but the former owner dont take care of them properly and give it to me.i keep some reptiles before especially snake.
the problem is i dont know nothing about sea turtle.
what to feed? can i keep them in fresh water? where should i keep them?
any info on this would be appreciated....
thanks before!


Kris.

ps:i keep them because if i dont then they will slowly die for sure.hope someday i can release them back to the sea.