How do you figure out your yardages for each club

I’m in month two of learning how to play golf and in a couple weeks I’ll be playing my first round.

Before I play, I’d love to figure out how far I’m hitting the ball with each club. I’m taking lessons and going to the range twice a week and am finally at the point where I’m making consistent contact and driving the ball straight.

What is the best way to get fairly accurate distances. I’ve read that I should be hitting 5-10 balls owe club and taking the average. Though I’m not sure how to get an accurate read on distance. The ranges I go to have 50, 100, and 150 flags and some just have targets with approximate distances. Am I supposed to take a best guess at the distance based on where the ball lands or is there a better/more accurate way?