It will work on your D60, with the camera in Manual exposure mode, Manual ISO, and Manual focus mode. Also the D60 does not support metering with non-CPU lenses like the Nikkor 105mm f/4 AI. You can use the Sunny 16 rule, a hand held Light Meter, or the Trial and Error method using the Histogram to nail the exposure. Good Luck and Enjoy your Nikons!
If I was to decide to get a light meter >do you have any suggestions?
There are Light Meters available in a wide range of price points from the old style needle types to the digital models. I use a Sekonic L-758DR. Keep in mind that the D7000, D_ _ series, and D_ series bodies will meter with AI and AI modified lenses in both Manual exposure mode and Aperture Priority mode. Good Luck and Enjoy your Nikons!