the best way to get good nightshots is definitely with a tripod or monopod... tripod being best, monopod being lighter and easier to carry....it's also a good idea to use the self timer if you can that way you eliminate camera shake from pushing the shutter release... you can also lean against a wall , a tree or any object that will help steady you, keep your elbows pressed against your sides and the camera tight against your face... this will minimize movement...
as far as manual setttings, that will vary depending on the subject and amount of light, so there isn't a simple answer, to eliminate camera shake, your shutter speed should be the inverse of your focal/lense length,,,, a 50mm lens shutter speed should be 1/50th or higher... 200 mm lens shutter speed should be 1/200th or higher and so on...
some camera shops sell small charts that give recommended settings for different lighting conditions...such as fireworks/ stage shows/ gymnasiums..etc
I'll check the one I have at home and post the name for it later if I have time...
any questions feel free to Pm me...