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Check your oil level. If you have a blown head gasket water would most likely (not always) get into your oil pan and increase the oil level with radiator fluid. The steam in your radiator was probably from the loss of water and over heating. If you run your engine, water in your oil could wash out (ruin) your piston rings and you could lock up your engine.
The first thing to do is take plenty of pictures and inventory everything you take off. You'll want to retain all of the parts for the next owner or for resale. Leave the vapor canister and hook it up. Pretty much everything else is up for removal
Use an incandescent test light clipped to a clean, verified ground to validate 12 volts to the headlamp. Probe the ground terminal in the headlamp connector, too. Low and high beam should illuminate the test light full brightness, selectively, whereas probing the ground wire at the headlamp should never illuminate the test light. Once you've verified power and ground, clean the connections with some WD-40 and re-test.