ID 1 really wasn't quite ready for prime time, so I still did most of my work in Quark back then. I made the switch at version 2.
My recollection is that Autoflow has been there since the beginning. You can also hold the Alt key to flow text from frame to frame (existing) without having to stop and reload the overset text by clicking the outport of the last frame each time.
As ken has said, put your header and page numbering stuff on the master page, with your margins set for the size of your main text frame.
When placing text you have a couple of options( I no longer have version 1 installed, so I can't verify this, but I believe it was true back then). You can use the text tool to draw a frame first. You can use a frame tool or shape tool to draw a frame and convert it to a text frame (more on that in a minute) or simply click the loaded cursor on the page and InDesign will create a frame on the fly -- a real timesaver. Making frames on the fly, the frame will fill the entire column width, with the top edge at the vertical position you clicked, and extending down to the bottom margin guide.
Edit: I left out that you can click and drag to draw the frame to size anywhere (works for images, too, which normally can be placed into existing frames, or a frame created on the fly, with ID placing at 100%, upper left corner where you click).
InDesign is as far as I know the only program out there that makes no distinction between shapes and frames (frames are made with tools with the X in them, and are hard coded with no fill color or stroke, and by default are expected to contain an image), while shapes are made by the sister tools without an X, and can have a stroke or fill set by default, useful for setting up keylines around photos, for example. Shapes are expected to have no content by default, but you can place any sort of content into either a frame or a shape, and you can switch from text to image, and back, without jumping through hoops.
Clicking in an empty frame or shape with the text tool makes it a text frame. Selecting an empty text frame with the selection tool allows you to place an image in it and convert it to an image frame. (If you place an image in a text frame with an active cursor it will be placed as an inline image in the text flow.)
If you get used to InDesign, you should really buy the current version. The feature set is lightyears ahead of what you have now.
Peter