I built a dimmer out of stuff from the hardware store. They were low on some stuff so I bought a dimmer switch that typically goes in a wall, an outlet plug, again the kind you install in your house, an appliance replacement cord, which is like a pre stripped extension cord. Wired it together and bam, a dimmer. Of course I should have built an enclosure for it, I shocked myself a few times. So if you DIY make sure to get an enclosure for it all.
For the bulb cords, they make cords like that, but you can DIY with an extension cord and a lightbulb adapter thing. Of course, if your going to be swinging it around, that's a bad idea.