USA, Canada / I'm moving to Poland from Canada! How to send my stuff over? [8]

ok...
so i'm moving to Poland some time over the summer months this year...
i have a bunch of family that lives there...
i'll be living in an apartment with a friend...we're renting...
i need to find out about sending my stuff over...
i have alot of things....no furniture though...
i don't know what the best (cheapest fastest safest) way to get my things there..
HELP???!!!???