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regarding your question about how to set the voltage, you do not set the voltage you set the current then the driver will generate whatever voltage is required to give your commanded current. This is probably what you want because LED's should be driven with a consistent current not a consistent voltage because their voltage drop will change over time.
You can work out if they are powerful enough by looking at their current rating and then look at how many LED's you are going to drive off one and how much current each LED will take.
You can run all of the LED's off the same output however they will not light evenly if you use the LED driver i have suggested unless the LEDs are in series. So if you want to drive them all at 2v in parallel then you will get uneven brightness because you can not set the current in each individual one. If you however decide to use a voltage regulator that goes down to say 3v then you use resistors on each individual LED to command the desired current off the 3v rail then that will work.
To work out if the current is too much for your wires you can do a voltage drop calculation, work out how long the wires are likely to be, work out how much current will go through them then you can find an online calculator or you can just look up the resistance per meter of the wire you are using and work it out that way.
hope that isn't too confusing.
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