Start with your landing page.
I think your web site design is graphically interesting. good.
But what is your business? You want to sell ads for used cars and collectible cars right? That concept doesn't exactly leap off the page.
I think a big headline(s) and more text would be better. And why is your ad service better than anybody else's? What's the benefit to your customer of using your service?
So I would go back to your copywriter or ad agency after you've brainstormed with yourself a little bit and
That concept does not scream out.
I wonder if you have ever heard of Stephen Pierce. He has a good eBook out about "the Whole Truth About Internet Marketing". He's made a lot of money selling his stock options trading services on the net.
Since you have a real product and service to sell, which you are evidently very enthusiastic about, this book can help you.Those are the first two elements you need!