Start by drawing your ideas on paper in detail. You don't have to be an artist because it's not going in a museum. If you are thinking of making a web site then draw it on paper, page by page. Describe exactly what happens when user clicks each part of the page. Every page, including the login page and about page. Every single page, every single clickable thing, draw it and label it. The more detail the better. You should have enough detail on those pages to be able to hand to someone without saying a word and they will be able to read it and understand it. That level of detail.
Then pay a web designer a few hundred dollars to turn your pages into a static mockup. Static meaning it doesn't actually work yet, you can't login and do stuff, you just look at it. It's just HTML and graphics. It's a facade.
Next you can either pay programmer anywhere from a few hundred to few thousand dollars and wait 3 months for them to build the functionality behind the facade or you go learn HTML, javascript, ajax, and PHP (the easiest programming language for novice web devs) and build it yourself.
Then pay a web designer a few hundred dollars to turn your pages into a static mockup. Static meaning it doesn't actually work yet, you can't login and do stuff, you just look at it. It's just HTML and graphics. It's a facade.
Next you can either pay programmer anywhere from a few hundred to few thousand dollars and wait 3 months for them to build the functionality behind the facade or you go learn HTML, javascript, ajax, and PHP (the easiest programming language for novice web devs) and build it yourself.