It looks like it's one of the Alocasia, Colocasia group of plants. There are many varieties and your local nursery will be able to help you.

I agree with the comments above as well. A garden with different types of grasses looks fabulous in a coastal environment. Your soil type may also impact what will grow best. I had trouble with planting out our front yard at our last property. I took a picture of the area I wanted to plant out to the local nursery and they were able to give me some really good advice of what sort of plants would survive. Also, decide what sort of garden you are after, e.g. low maintenance, native, colourful, or something you need to tend to. There are so many options, but deciding what you are after will make a huge difference in the type of plants you should get. Gallifrey your garden is beautiful, love those cute little green mounds!

Congrats on choosing blocks for your garden bed. If you're looking for trees, I suggest considering a maple tree. They grow nicely over time, providing shade and privacy. I recently moved to a new house myself, and I'm also exploring plant options. Back in my hometown, we had a reliable tree service that helped us with planting and maintenance. Maybe you can find something similar in your area. I came across this website, https://www.deepdale-trees.co.uk , which might be helpful for you. They offer a variety of trees and services.

yes, they are elkhorns, very easy to look after, very structural, google care for them , they live for many years and new growth is gorgeous, lucky you.