Autoresponder alone or with a landing page generator?

Hello

I been planning for so long to promote one of the products we make at our lab through media buys (banners and solo ads) that now I'm way passed the launch dead line and everyday that goes by the situation just get worse

And the more I keep reading the more confused I get, specially now that I found out that some responders have landing page and newsletters creators

Now I don't know if should I use an AR by itself or with Leadpages because that was the original idea

What would be the best strategy to follow for someone who has no time to create a whole website full of content ?

Thanks for your suggestions