If you are going to dose additives individually then be sure to pick up all of the appropriate test kits for what you are adding. I only recommended the 2 part formula for its ease of use and convenience, especially for people just starting out who do not yet have very high calcium and alkalinity demands. In my opinion it is good to start out with the keep it simple method and gradually increase the complexity of your system. This way it will be easier to narrow down potential problems.
A good way to dose your tank in a slow and consistent manner is with a steady drip. This can be accomplished numerous ways including purchasing dosing equipment or build yourself a quick $3 doser like the one here -
http://www.fragoutpost.com/forums/showthread.php?t=8
This is not absolutely necessary. You can just mix the additives with some tank water and add to your tank as necessary. The only way that you should have a cloud of calcium in your tank is if the calcium is precipitating which is not a normal occurance. Under normal circumstances these additives will not cloud your tank or have any adverse effects on your fish. As with any dosing regimine, start slow and increase your dosage as necessary. It is always easier to add more to a tank rather than take some out when you've added too much. Over time you will most likely develop a routine and will be able to spot problems before they get out of hand.