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1_ it helps to initially position the secondary.
2_ a cheshire is needed yes. I assume you have a central spot on your primary?
3_ yes you do. Laser is good but you need to check visually as well.
The GSO's fine. I've got the same from Andrews. Make sure it's collimated too. Stick it on a lathe and project the red dot on a wall at 3m. Screw the hex heads until the dot stays stationary when spun.
Check your scope on a star with a barlowx2 and a 10mm eyepiece. Defocusing will show you concentric rings if collimation is alright other wise they'll be offset or your star shape will be odd.
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