I prefer writing pads with perforations, so you can tear sheets out and sort them into file folders. Any white letter-sized pad will do, but my favorites are Levenger's heavy-quality paper with wide margins.

For pens, I like the Uni-ball Vision pens, either the "fine" point for general writing or the thinner "micro" point for diagrams and annotation, with black ink for everyday work and a couple of bright colors for places you need highlights or variation.