Welcome to the forums squidgy!
How to install brushes
Place the *.abr files into:
*:\Program Files\Adobe\Adobe Photoshop *\Presets\Brushes
Brushes created in Photoshop 7 or later will not work in earlier versions of Photoshop. Any Photoshop brushes should work in Photoshop 7 and later! But this is probably not a problem.
From the Brushes Palette in Photoshop, click the small arrow in the upper right corner of the palette, and choose load brushes. The brushes will be added to the current brushes.
It's not hard, but if you've got any problems let us know! 