Check out some good advertisements in your niche.
Try to compose your advertisement yourself.
Hire a proofreader to proofread it because english is your second language.
Do best and I hope this helps.

Learn more english, and check out competitor's ad copy.

Just type your keyword in Google search and see which ads come up. Then copy and paste the ads in a notepad. Do this for at least the next seven days. Then take the ad that shows up the most and create a variation

No need to reinvent the wheel!

If you don't have the time to learn the language, you can always outsource to translation services like onehourtranslation.com