Change layout of a Shopify template landing page

I'm building a landing page on Shopify for my clothing brand due to launch later this year. The purpose of this landing page is to get people to sign-up to my newsletter.

I'm using the Brooklyn template, and can't figure out how to:
- have a newsletter signup block with text sit directly beneath the Heading text and overlay the Heading image. I don't want the block sitting beneath the heading image, as I don't want people to have to scroll down to sign up to the newsletter. I want it all in one, like this website for Eatsundays . com .
- I also want to see what my landing page would look like with my logo large, and up against the top left corner of the landing page. At the moment, the template only allows for the logo to sit an inch from the edges, and I can't make it large.
- Temporarily remove the cart symbol from nav bar. I will need to add this back in when I turn the landing page to a full ecommerce website later on.
- I would also like to see the page with the header text moved to the left.

See attachment for an idea of what I mean.