If you want to earn any money with this way, learn to design on your own. You shouldn't rely on someone else for this. It could be fine for a side hussle but you are on a highly unstable enviroment for an income. Relying on someone else will make it even more unstable. It could just be my wannabe independent side but seriously, learn how to do it.

İf you can, tell me how can you did?

Let me know if it work

Read the agreement carefully if you've made one. It might contain some copyright or licensing pitfalls that might get you in trouble.

You are absolutely right.

That's okay

It's kinda risky but the budget that you're risking is not that much so let's wait and see if you make some profit. It would be much better if you learned web designing by yourself and sold your own designs without any developer cost.

Hi everyone! I had 60 dollars. I needed a website design. By the way, I hired a designer to design it for me. When it finished, I think to sell it on themeforest. I hope, I will earn more this way.

You are definitely right.