This is going to sound harsh. Not my intent... but it's the truth.
If you don't already know the answer to your question, don't go into business until you do. You're business will likely die an expensive death.
Your question sounds very similar to... How do I "land" my first date?
Just what prospective date with a women/man wants... to be landed. Right? ;-)
The better question is how to I EARN a client?
I go back to my first point... if you don't already know this, I'm making the assumption that you've never google/youtubed the subject of sales.
I know I sound harsh, like a jerk. Not my intention. If you're going into business with any amount of seriousness, sales had best become I high priority to learn.
Start with anything written by Jeffrey Gitomer. The Sales Bible. The Little Red Book of Sales. etc. Gitomer has a ton of wisdom on YouTube. I suggest Gitomer (there are many other people to learn from) because he isn't about tricks, gimmicks, or slippery techniques... He's blunt. He's candid. He wants you to be successful.
Here's two of Gitomer's videos to give you a starting point.
The two most important words in sales: https://youtu.be/X7E2NHPkI_E
Asking powerful questions:
Business is a contact sport. It's not for the faint of heart. It takes work - a lot of work - and sales (generating money) is obviously the lifeblood of your business. Make sure sales becomes a core competency... or. you. will. struggle. or worse...
Put a mechanism in place to track your sales efforts and customers earned. This is important data that you'll need to make future decisions - so track everything related to your sales experience.
Last thing. You're client doesn't want to be "landed" any more than your unsuspecting date does.... you earn the client's business. Just like people have earned your business.