1. Make sure you have the Brush Tool selected
2. Click the Toggle the Brushes palette button - the default place for this button is in the top-right corner of the screen, to the right of the tool options (it looks like this: )
3. If you have a hard time finding it, you can click Window on the Menu bar and then click Brushes to end up in the same spot

Something like what you see to the right here is what should pop up. On the bottom, you have a preview of what a stroke with the currently selected brush would look like.

Each item on the left of the window has its own set of options that appears on the right when that option is activated. By activated, I mean that you click on the name of the item, not just the little box - in other words, the item name needs to be in blue to see the options. In the graphic on the right, the Brush Presets is selected and thus you can see all the preset brushes.

There's not much to this part. The Brush Presets is a place where you can store and recall brushes you commonly use.

The image to the left is the set of options that appears when we activate the Brush Tip Shape tab. Here you can select one of the existing brush shapes, or make your own. You can define round brushes by adjusting the values for Angle, Roundness, and Hardness (Hardness controls how solid the edges of the circles are, with 100% being solid [good for inking] and 0% being a soft fade into the middle [good for airbrushes]).

You can define a more complicated brush by drawing it freehand in black-on-white, then select it with a marquee tool, and click Edit then Define Brush. Remember that there will be a controller for diameter in the Brush's options bar, so you don't have to define a bunch of different shaped brushes that are all the same except for different diameters.

The rest of the items control various features of the brush system. The Shape Dynamics item pictured to the right is definitely one of the most useful ones. Notice how the example stroke at the bottom of the graphic is tapered at both ends? That's because the Size Jitter control (at the top) is set to "Pen Pressure". With a brush like this, if you have a drawing pad (if you want one Hays has 5 or 6 of them that you might be able to borrow), size will vary depending on how hard you're pressing down on the stylus. Other information about the stylus, such as angle and tilt, can be assigned to parameters of the brush, giving you great control over the pen strokes you can make.

Notice the other "Jitter" sliders here. If one of these is up, the parameter it controls will be given a random value for every single step along a pen stroke, so it can get some really interesting chaotic-looking bushes. These sorts of brushes aren't too useful for the plain inking we're about to do, but they work great for coloring and effect work.

The Shape Dynamics here is just the first page of these sliders. There's many more in Scattering, Color Dynamics, and Shape Dynamics. The effect of all these sliders can be plainly seen in the stroke in the bottom of the window, so we won't go into much detail about them here.

Two other items deserve some explanation. The Texture item manipulates the parts of the brush that are only partially solid to be more or less solid depending on a bitmap pattern, which can give your strokes the illusion that they were made on textured paper. Sounds complicated, but don't worry about it right now. The Dual Brush item is just like the Brush Tip Shape item, and lets you define a second brush that will be drawn along the same line as the first. This can be useful for making complicated shapes from image-based tips.