flee market is your friend!
On Canon EOS you can adapt many old manual lenses - and for filming that is ok - You can look for m42 mount (Zenit, Praktica), K mount (pentax), and Nikon F lenses. Adapter would cost 5-20$, and manual lenses tend to be cheaper because they are impractical for photography, but are good for video.
As of lights - you either buy them or build them. Kinoflo type lights are pretty easy to build and doesn't require a lot of power, also light is quite nice and soft. youtube is full of DIY solutions for lighting. Sometimes you can find something real cheep that with few modifications would become grate light, so think about that.
Lens wise you are pretty much covered, except you would need like 20mm, 35mm, 85mm fast primes, but in general you are fine. 17-50 2.8 is good for most work, and if it is to dim - only lights can help - going to f/1.4 is only 2 stops, meaning you could go from iso 1600 to 400 but you would have problem focusing, as 2.8 is already hard on that tiny camera screen, and believe me, cinema is not so flat space/shallow depth of field, if not to say opposite. They just can light the place up. Lens and aperture should be a creative decision, not out of exposure.