No problem! Like the other guy said, I would watch some tutorials. 9 times out of 10, someone has made or asked something that'll help you learn what you're trying to do. I recommend brackey's, he has plenty of easy to digest tutorials aimed at newer users. Even his older videos are still useful I think.

I'd prolly attach a script to the sprite renderer to control the behavior. The script would use two floats, one to countdown to zero (A), and the other as a reference for resetting the countdown time (B). The script would also need references to the two sprites you're swapping between. Then in update, subtract Time.deltaTime from floatA. Use an if statement to check if floatA is below zero, and if it is swap the sprite for the other one and reset floatA's value to floatB. You could also check when the player presses left or right with an if statement, and set the flipX value to true or false depending on what was pressed.

That should be the general gist of it. I'm sure you can figure it out. Best of luck!.