Problems with creating a mask in AE 4.1

Hi all,
Yes, I'm using After Effects 4.1... not CS4... that's version 4.1 from 13 years ago.
I'm having a problem creating a simple mask and I can see from a more current AECS5 tutorial that creating a mask on a layer is similar to creating one in AE4 based on a comparison to an old AE4 tutorial.  I've read instructional material and it seems simple enough, but for some reason its not working for me... I know I'm doing something wrong.  I'm an advanced Photoshop user and I know the concept of layer masks and how to create them.
I create the mask on a layer and I can see and adjust the bezier points to adjust the shape of the mask... adjusting the shape of the mask by the bezier points is a little tricky since it stretches in both directions when you grab a single point, but that's okay,
But no matter which mask mode I try, Add, Subtract, Intersect, Lighten, Darken or Difference, it is not masking the layer that it is attached to even when I preview the timeline.
I don't want to just create a color layer on top of the layer I want masked to simulate a mask (which I can otherwise do) because I want to stack layers with masks and have the unmasked parts showing through (like in Photoshop), without rendering separate layers and re-importing them with blue screening or black screening... I should just be able to mask the parts that I don't want to show up on each layer and only have the unmasked parts of each layer show through each other for my final render.
Thanks for any input,
digi

Thanks for writing back Dave and Rick,
I think there is something in what Dave said about opening a new layer window, but it still isn't working right.  Please see the screenshot of two full project windows below.
One thing that could be giving me problems is my layer content... it is a numbers layer attached to a solid layer, as you can see.
In the comp window at the top of each screenshot below, you can see the bezier points from my original mask that I created by clicking on 'Shape' next to 'Mask' on the left in the timeline window after selecting 'Layer>Mask>New Mask'... but I can see that this isn't the right way to do it because (1) it isn't masking, it only shows bezier points. (2) When I try to adjust those bezier points in the comp window it only stretches the numbers. And (3) when I'm in the comp window, I don't have access to the layer shape square and oval tools... they are grayed-out.
So in the layer window after double-clicking on my numbers layer, in screen #2 below, you can see that it isn't showing anything... just black, but you can see the bezier points from my original masking attempt that also show up in the comp window.  But in that layer window I do have the square and oval tools available to me and you can see that I tried creating a new experiment with a triangle mask, but that only shows bezier points and no masking effect.  When I close that window, as Dave said, after making the new triangle mask, it only broadens out my original mask besizer points in the comp window to encompass both masks now, but does not reflect either masks actual shape, nor is it actually masking anything.
Let me know what you think.
Thanks again,
digi

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