I want to know how to connect ESP8266 ESP-01 to L298N Motor stepper for arduino Uno Atmega328? I am new to Arduino development and I want to know how to do that, I already have 3.3 volt regulator for ESP8266 ESP-01 but I just don't know how to connect it to L298N Motor stepper. If you could please provide me some info or sketch on how do it, thank you. 
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You can most likely use the Arduino libraries, and follow the instructions that come with it. AFAICT the board works at 5V so you may need level shifters on the I/O wires.
The board appears to require four outputs, so the ESP01 is the wrong module for it. You may be able to make it work but won't have any I/O left other than its WiFi. Get a proper development board like the NodeMCU or WeMOS D1.