I tried different kinds of drivers but i cant drive leds properly, please help me
High power LEDs are normally driven by a switcmode constant current (or "controlled current") driver. That's not an easy thing to build. There are dimmable drivers that can be driven by PWM.
The "commercial standard" for dimming is 0-10VDC or 10V PWM. The PWM doesn't (normally) go to the LED, it just controls the driver. But, you can probably find hobby drivers that work with 5V PWM.
[u]This driver[/u] would probably work for you.
If you are wiring the LEDs in series you just need enough voltage available and the driver will keep the current constant (controlled) and the voltage will fall into place.
For LEDs 3 in series you'll need more batteries (or otherwise more voltage). In parallel, each LED needs it's own driver (and you'll need 3 times as much current).
"RAW" high-power LEDs also need a heatsink. They don't get nearly as hot as a regular lightbulb (of the same brightness) but they can't take as much heat as a glass/metal/tungsten lightbulb.