Welcome to the forum!
No worries -- we can get it sorted out. But first I need to understand a little better.
Lesson 4 of which tutorial? It doesn't sound like what you're seeing are actually nodes, so I'm worried whichever tutorial you're using might not be giving correct terminology.
Whenever the Ellipse tool is enabled, it does have a tiny crosshair, but it's beside a small oval. The crosshair can help you align the new object that you're about to draw, although by itself, it's probably not very precise.
But when you click-drag, you should see an oval being drawn. If you don't see that, and all you see it 2 tiny circles and a tiny square (and a large dashed line rectangle), then probably you have made the last thing you drew with the Ellipse tool transparent. Here's an article which can help you find the problem:
http://forum.inkscapecommunity.com/index.php?action=articles;sa=view;article=18Let us know if you still can't get it working, and we can provide more details.