First you have to purchase the game but after that it is free to play.
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You can play Starcraft Broodwar online on Battle.net.
You can go to UDP Connetion and find the guy with the same starcraft code and play um
On Amazon.com they have a PC-Mac (OS X) version of Starcraft (the battle chest) for only 20 dollars. If the game is actually meant for OS9, then you can download a free starcraft osx installer from the apple games website.
however old your parents want you to be. It is rated T
Legally, there aren't any options, but torrent sites are your next best choice. For example, you can google "Starcraft torrent download" or something similar.