These could be seperate issues all together perhaps, the clutch does sound interesting, you might have missed something in the process of changing you're clutch? Also don't forget (I think) about the clutch slave (Not sure if VW beetles have one.. but I'd assume most if not all manual cars do).. Just check it over, making sure that everything is in its correct place/position.
As for the lights/turning over.. make sure all items that use power to start are turned off (e.g. headlights, interior lights, radio, etc..) If the problem persists, check (maybe, but unlikely) your ground? As well as remembering to check the charge of the battery.
(Note: I do not own a VW, this is my knowledge of what I would do in the same situation. I do not hold responsibility for damage or harm that happens to the vehicle or yourself, this is just what I would do in the same position)