Hello,

01. Navigate to contact form > Edit form > Add the fields like this:

<div class="contact-form-container">
    <div class="contact-form-column">
        <label for="email">Your Email (required)</label>
        [email* your-email id:email]
    </div>
    <div class="contact-form-column">
        [submit "Sign UP"]
    </div>
</div>

Then Navigate to Theme Settings > Custom CSS > add the following custom css code.

.contact-form-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}
.contact-form-column {
    flex: 1;
}
.contact-form-column label {
    display: block;
    margin-bottom: 10px;
}

Change the styles as needed to fit your design preferences.

02. Try to create the slider and banner manually on your site.
https://xtemos.com/docs-topic/how-to-create-a-slider/

OR try to create a staging site:
https://www.wpbeginner.com/wp-tutorials/how-to-create-staging-environment-for-a-wordpress-site/

Import the demo on the staging site as you want and you can import-export any content by means of default WordPress functionality: Dashboard > Tools > Import/Export. Export the content from the staging site and import it on the production site.

Best Regards.