To answer your second question first: no, the tutorials are not available in PDF format.
In answer to your first question: it is assumed that anyone downloading resources from BioRUST already knows how to use them, so we don't supply tutorials purely for "How to use actions/brushes/custom shapes etc."
If you need guidance on using any basic function in Photoshop, the first port of call should be the built in Help - just press
F1 in Photoshop. Failing that, you will find more help is just a Google search away. For example, here is a comprehensive guide to using Actions:
http://www.peachpit.com/articles/article.aspx?p=434249