How to create a design with the target audience in mind?

Question

Marketing

We need advice from professional designers, typographers, marketers.
The essence of the problem:
I want to make a landing page for selling the services of a web development tutor.
The target audience is divided into three groups:
[<16] [16-23] [>23], detailed statistics on it can be found here
vk.com/stats?gid=78752780
Questions:
• How to correctly formulate TOR, choose fonts, icons, colors, images, text content, taking into account the target audience, in order to interest people in buying a service?
• What questions should I ask myself to achieve my goal?

Answer 1

Tip: less italic and bold , and mix italic with bold .
The rest costs money.

Answer 2

You are going to sell web development consulting, but you yourself want to learn everything for free. OK. To achieve the goal, you need to ask yourself only one question:
If you think that we are moving all the rectangles here and eating doshirak, then I have sad news for you :)