I get it......but not really

Let me start this question off with an apology right from the get go. I used to be part of a forex forum and it would sometimes annoy me when newbies (like myself in this case) would come along and ask the same questions over and over without ever bothering to read through the threads to see if the answer lay within already. So if my questions have already been covered, I apologize to you all in advance and would appreciate a gentle nudge in the right direction as to where to find said threads.

Now that the grovelling is out of the way, here's my points. With the exception of people who are yet to be born, I'm probably the newest person to Internet Marketing on the planet, having only "discovered" it less than a week ago. Obviously I get the basic principal, promote and sell a product that either belongs to someone else, (or that you have created yourself) and receive a sales commission, ok I get that.

I also understand that in order to actually sell any product you have to create an awareness of your product, (web-site) and attract as many buyers as you can to it.

And that's where the "I get it" part ends and the "but not really" begins. For I have been sitting staring at youtube videos for the last few nights trying to work out the answers to the following questions, without much luck at all.

First of all market research, find what people are searching for, then find the product and sell them it. To do this you need a web-site.

Q1. Is your web-site a "once created never to be touched again" thing or do you need to keep adding new 'material' to it?

Q2. If you do need to keep adding new material to it, how do you do that when you don't have a clue about the product your trying to sell??

Let me elaborate that last question somewhat. The other night I watched a youtube video by a woman who says she is an internet marketer, she may or may not be, I don't know. However in her video she says she was watching TV one night when a commercial came on claiming that 80% of Americans may well suffer from Adrenal Fatigue.

This then, she claims, gave her the inspiration to go research how many people search the internet for Adrenal fatigue and go on to create a web-site promoting a product in the mass battle ground which apparently is Adrenal Fatigue. Here's the bit I don't get about that.

How on earth do you create an entire web-site about a subject you know nothing about? You're not telling me this woman just happened to be a leading expert in the Adrenal Fatigue Field.

So I guess that's my main question, say you find a niche in say .................. chanters for bagpipes. However, like most of us you don't have the first clue what a chanter is, or even why a bagpipe would need one!! How on earth do you then go on to create an entire web-site, or a sales campaign for that matter, around something you haven't the first idea about??

Actually, I guess the chanter thing is not really a good example because there's not really a lot to find out about them, but Adrenal Fatigue? SERIOUSLY?? Surely in that case, giving out the wrong information could be dangerous at best?

Like I say, I am extremely new to all of this and I thought rather than spend another night staring blankly at a computer screen, hoping the answer would magically pop up somehow, I'd take the huge step of actually asking a question.

Apologies as previously mentioned if this sort of thing has been asked a gazillion times before.

Thanks to all who take the time ans effort to read and reply to my dilemma.