user53434: I am doing a project for school to run 462 LEDs in 6 series (77 each) and a stepper motor altogether, I wanna know what model of Arduino I should buy (not so expensive)? 
I am using individually addressable WS2812B RGB LED strips ...
So it should be controlled in 6 groups of 77 LEDs in each group. 


user42015: With these requirements you can use most available Arduinos. The WS2812 LED strips need 1 pin per strip (or 1 pin in total, if you daisy-chain all the strips, meaning connecting the data lines of them to one big strip). How many pins you need for the stepper motor depends on the type of motor and what type of driver you have for it. Most stepper drivers need 2 digital pins from your Arduino (1 direction pin and 1 pulse pin). There are also cheap drivers based on the ULN2003 chip, where you have to control the phases directly, needing 4 pins.
You should also buy an Arduino, that leaves you a big headroom to develop your project further, if you want.
An Arduino Uno or Nano would be good fitting for this project (though smaller Arduinos like the Pro Micro also would work). If you are able to order them over sites like Aliexpress directly from china (and if you are ok with a longer shipping time), you can get Nanos for 1 - 2$.

Since you have many LEDs, you really have to consider your power supply. 462 LEDs, which need up to 60mA each (20mA for each colour in full brightness), means you need at least a 28A power supply (in total). And don't draw the LED current through the Arduino, or you will fry it's voltage regulator or diode.

53434: <p>I am doing a project for school to run 462 LEDs in 6 series (77 each) and a stepper motor altogether, I wanna know what model of Arduino I should buy (not so expensive)? 
I am using individually addressable WS2812B RGB LED strips ...
So it should be controlled in 6 groups of 77 LEDs in each group. 
<a href="https://i.stack.imgur.com/PoHsE.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PoHsE.gif" alt="enter image description here"></a></p>
 42015: <p>With these requirements you can use most available Arduinos. The WS2812 LED strips need 1 pin per strip (or 1 pin in total, if you daisy-chain all the strips, meaning connecting the data lines of them to one big strip). How many pins you need for the stepper motor depends on the type of motor and what type of driver you have for it. Most stepper drivers need 2 digital pins from your Arduino (1 direction pin and 1 pulse pin). There are also cheap drivers based on the ULN2003 chip, where you have to control the phases directly, needing 4 pins.</p>

<p>You should also buy an Arduino, that leaves you a big headroom to develop your project further, if you want.</p>

<p>An Arduino Uno or Nano would be good fitting for this project (though smaller Arduinos like the Pro Micro also would work). If you are able to order them over sites like Aliexpress directly from china (and if you are ok with a longer shipping time), you can get Nanos for 1 - 2$.</p>

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<p>Since you have many LEDs, you really have to consider your power supply. 462 LEDs, which need up to 60mA each (20mA for each colour in full brightness), means you need at least a 28A power supply (in total). And don't draw the LED current through the Arduino, or you will fry it's voltage regulator or diode.</p>
