New to Arduino, Have what might be an over ambitious project NEED HELP!

hello, everyone.  asked if create arduino-controlled e-hookah.  clarify, 4 heating elements controlled 4 buttons, leds , pretty stuff that.  i'm new arduino said, , i'm not sure how go it, delaying me buying board until know need.  here's specifics:

i need source (4) 3.7 volt outputs(one each heating element) , whatever i'd need run leds.  need separate batteries this, know, how control voltage going each heating element?
beyond that(and being ambitious), how difficult make each output variable voltage, in controlled dial, within given range(roughly 3-4.5 volts).  add low power cut off well, these things can wait until figure out if works @ all!

i'm thinking of 4 separate circuits, basically.  1 circuit each heating element each power supply.

so i'm asking is:  i'm thinking possible?  can control voltage secondary power source?  how difficult be, 4 separate sources necessary, , having more 1 heating element make more difficult, if so, how much?

"variable voltage" done using pwm; see reference page analogwrite(). using pwm you're pulsing power device between full off full on in 255 steps, ~500 times second.

if heating elements need more 20ma of current you'll need use transistor. 20ma of current recommended limit arduino output pin.

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