Starcraft – Brood War Multiplayer Maps

The W-MODE plugin for launchers like ChaosLauncher will make StarCraft run in a window. Works perfectly, even under 64-bit Windows 7.

With this plugin, you can lock the mouse cursor inside the game window to avoid accidentally moving the mouse outside when trying to scroll, you can lock the window to prevent it from being moved, and you can have it double the window size to make the game take up more of the screen (which may be helpful, since Starcraft runs at a pretty low resolution and it may be hard to see things otherwise).

Before SC2, you had to tell each worker to begin mining manually. Simply setting a rally point on a mineral patch did not get the job done. Basically, you get used to setting a rally point in an area right next to the town hall building where workers aren't constantly pathing back and forth. That way, when the worker is done, you can go select it quickly and have it start mining. There was no 'idle worker' button in SC1, unfortunately, so that shortcut won't work.

As for workers per patch, it's roughly the same as SC2: You get diminishing returns when you go from 2 workers per patch to 3 workers per patch, and using more than 3 workers per patch is not worth it.

Perhaps unsurprisingly, there is a guide to BroodWar for SC2 players on Team Liquid's site for the differences between SC:BW and SC2. If you're going to be playing SC:BW a lot, check it out. It covers the worker and building selection items you mentioned as well as a few other points.