What platform are you on? Managed WordPress? cPanel?
If it's a WordPress site, there are plug-ins that help you with this, such as https://wordpress.org/plugins/wp-construction-mode/
what if its Cpanel? Its too early for me to create the page, but the homepage address is already on my business cards and I want to show the logo and coming soon sign with my email or instagram account details until I find good designer to work on the page
Here is a sample Under construction page http://oslinux.xyz
This is a sample and can be changed to fit your needs. I tried to post the HTML Code in a Code tag but kept getting a permission Denied when trying to post so I have attached the html file. The file will need some changes but can be used as a base.
to enter a new line use
any text not between "<>" can be changed as that is Text that will show on the page. For the Email link you can delete it or change it to your email address.
<a title="Email Link" href="mailto:email@example.com">firstname.lastname@example.org</a>
replacing the email@example.com with your email address.
You will need to upload your business logo to the same location as index.html and then replace fedora.jpg with the name of your image file.