That's a more than decent camera and a so-so, but adequate, lens.
Pens are a hard place to start learning to take pictures; they're challenging to light and, at the ranges we normally photograph them, maintaining focus and depth of field can seem mysterious.
The first best thing you can do is probably to work on a source of good diffuse white light. The camera-mounted flash is a lousy choice most of the time; it gives strong reflections and throws very harsh shadows. Most of the guys here use some sort of light-tent to diffuse light from at least two (off-camera) directions. There are a lot of these setups described in the forums, some professional rigs, some made with Tupperware and cardboard. You can use fancy photographic lights, or light from a bright window and a sheet of mat board as a reflector to balance the lighting.
The other advantage of having copious good light is you can use a smaller aperture for the exposure, giving you greater depth of field (this will help to keep both ends of the pen in focus). You can set the camera to aperture priority (Av mode on a Canon) and stop it down manually (to f12 or so on the kit lens (larger numbers are smaller apertures)) and let the camera figure the shutter speed. Stay away from extremely small apertures; bad stuff happens out there.
Experiment and have fun. You'll have to balance your time and budget between two addictions if you're not careful.
--tom