Step 1. Start collecting images and clips.

Step 2. Start collecting sources for images and clips.

Step 3. Cultivate a network of like minded people who will share images and clips they find and/or have collected.

Step 4. Periodically try to organise the images, be surprised at what good taste you once had.

I’ve collected mine from tumblr, Insta, r***it, Telegram, now also Lemmy, and more. The trick is to save the clips/images and not delete them :p