Scenes? Note Cards?

Yes, a slugline or scene heading indicates a new scene.

In a spec script, minislugs may be used for brevity if a scene has already been visited previously, e.g.

KITCHEN

but if the script sells then someone, probably at the prodco, will go through it and change the minislugs to full scene headings.

Writing your scenes headings on note cards gives you the option to move 'em around on the table or cork board so you can decide the best sequence of events. This can be done before writing the script, or during. Pro software programs like Movie Magic have a scene card view option, where you can click-and-drag scenes around as if they were actual cards, and the script will be re-ordered based on this action. You don't have to use cards (or software) but it's a useful planning tool.

-Derek

You can write that any way you like -- you could kick off with EXT. PARK - DAY and simply write what happens next, or you could break it down into a series of scenes, e.g. EXT. PARK ENTRANCE - DAY / EXT. PARK KIDDIE PLAY AREA - DAY / EXT. PATH THROUGH PARK - DAY / EXT. PARK WOODED AREA - DAY etc. As long as it's in plain English and easy to understand.

If I haven't already suggested this before, check out the screenwriting tips sticky thread which has links to sites full of scripts free to read for educational purposes. The answers to these and dozens of other basic questions can be found by reading scripts.

-Derek

Just remember that you have a new scene everytime you change the location or skip time (even if its 10 secs).