It is different for each model of ipod.If you have an iPod Touch you hold down the home button (with the white square on it) and the power button on top at the same time until you see the Apple logo....
charge itif that doesn't work go on the mac website and look at its handbookchances are that if charging it doesn't work you'll need a replacement though
Probably not, unless you are qualified to do this and live near enough to visit me.
If my answer puzzles you, try showing your question to someone who is good at English.
If you are really...
Battery out. Leave it to dry for a couple of days. Try a different battery; sim card; charging; not charging (try all combinations). Take it to a repair shop.