Apparently there is an endless ocean of excellent meditation literature available via the internet. Here's a 500+ page manual on mindfulness of breath, written by a revered Thai meditator and author, Buddhadasa Bikkhu. More accessible than the Vishudhimagga for sure.

www.buddhanet.net/pdf_file/anapanasati.pdf

Anyone who is stuck wondering what kind of meditation to do, or what kind of concentration object to use, should note that mindfulness of breathing was recommended by the Buddha himself. The manual goes into detail as to why mindfulness of breathing is superior to the other 40 objects that are traditionally part of Theravada Buddhism.