Lens

[Zarch]

I can't remember the shutter speed but I was zoomed in between 24-35mm

Shutter speed it vitally important to getting a sharp shot too, you really need to know what you are set it.

And as Andy says, the relationship between shutter speed, aperture and ISO is key to getting sharp shots...... and obviously understanding it how the three elements interact.

That book I pointed you towards yesterday helped me "get it"..... and there are other guides on the internet that can help too.

Until you get how it all works i'd certainly hold off buying that new lens.