maybe is a little too late for you but for new people, these tips can be handy.

Don't ever keep a large number of coins on an exchange, you never know if they could go under completely or just lock your account. Always store your coins in a wallet that you have the private key to, that way you and only you have control over your coins.

When creating a new wallet, don't store your private key on your computer. Write it down on a note card or piece of paper instead. Then copy it to 1 or two other note cards. Once you have done this, before sending any coins to your account, log in to your account only by typing in the private key that was written on each note card to ensure that you wrote it down correctly.