This is going to probably sound a but brutal, but ... it isn't, not really.
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I have no idea about coding
That's the problem.
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I searched on google a lot
That's not the solution.
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I still don't manage to get it done like I want
And - I hate to say it - you won't, either.
The problem is that you are assuming a huge number of things, most of which are not true.
You want something to work, and you think that the way to get it is to find it on the internet - or the "bits of it" at least - and that it'll all just work together when you do.
That isn't going to happen, and the way you are approaching the problem is all wrong.
What you need to do is cure the problem, not find a code.
And the problem is this:
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I have no idea about coding
That's the problem you have to fix, and it means putting effort into learning how things work, and how you make them do what you want.
There is no complicated field out there that you can walk into as a total beginner and start doing the job: or at least littel beyond "dig me a hole, over there". Even a starter job in McDonalds requires mandatory training: health and safety, hygiene, wearing the uniform and right name badge, not killing the customers, cleaning the loos, turning up on time for your shift.
And what you are trying to do is far more complicated than cooking fast food!
You need to learn: I'd suggest a course, or a book:
How Long Does It Take To Learn WordPress? - Eggplant Digital[
^]
I know that isn't what you wanted to hear, but it's the truth: anything complicated takes work, knowledge, and effort - that's what builds experience - and at the moment, you are putting your effort into the wrong direction.
Good luck - I hope you get there!