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You should look at getting a cheshire/sight-tube from Bintel or somewhere. They're only $50 or so and are more accurate than a film cannister (which I also used in the beginning).
You can then shine a red light on a reflective surface and light it up at night.
For the secondary,
1. Make sure the secondary mirror appears round and centered in the middle of the focuser (you don't need anything in the focuser for this). Just make sure your head is aligned.
2. Now use the 3 screws on the secondary to adjust the tilt so that the primary mirror is centered within the view of the secondary. I use the mirror clips as a guide - that is, ensuring the mirror clips of the primary touch the edge of the view in the secondary, equally all around.
You can use a sight-tube for this.
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