There is no Draw layer as such in Pages. They are just objects placed wherever you want them.
In Pages 6 objects, not just images, can be
1. Inline with a number of ways they fit, so they flow with the text
2. Anchored so they flow with the text but aren't in it. Whilst the object can be freely positioned on the page, even outside the margins, the anchor can be difficult to place. It seems to not want to go where you put it.
3. Floating so it stays on that page and does not move with the text.
4. On the Master objects layer, under everything, repeating on every page of that section.
Drawings are just objects, called Shapes, which can be coloured or have a wide variety of effects including multiple styles of shadows, or act as masks to images. There are a large number of ready made shapes under the Shapes menu and you can create your own and add them to the menu.
You create shapes by either drawing them as bezier objects with the Pen Tool under Shapes, or by combining any shapes using boolean operations in the Sidebar > Arrange panel. These tools are vastly superior to those in Appleworks and can have Styles that can be applied and updated just like Paragraph and Character Styles. The only thing they don't retain as Styles, which they do in Pages '09, is their Text Wrap.
If you intend to use Pages '09 update it to the latest (ultimate) version 4.3 to use on all the latest macOSes. iWork '09 will have issues and may actually freeze up. Pages '09 and Pages 5 or 6 can be used on the same Mac, just be careful which opens which document.
Peter