First thing that platform should I choose? I believe the most easy way to construct a webshop is to use a CMS system. Systems are systems that are well-tested and very popular. And these systems are easy to use and simple to customize. I advise you to choose WordPress. Why? My customers can't use the majority of the CMS systems, although I'm a software developer, so I can use any CMS system easily. My experience is my customers can learn WordPress in a short period and they can use it without my aid. And you will see at the end of the article.
It helped me although my first step is. I had a fantastic old style pity party. I cried and railed against the evil hackers (that where probably 13 and smarter then me.) And I did what I should have done before I started my site. And here is where I would like you to start. Learn how to protect yourself until you get hacked. The beautiful thing about secure your wordpress site and why so many people recommend because it is really easy to learn it is. Unfortunately, that can be a detriment to the health of our websites. We have to learn how read the full info here to add a safety fence.
Use strong passwords - Do your best to use a password, alpha-numeric. Easy to remember passwords are easy to guess!
For me it's a WordPress plugin. They're drop dead simple to set up, have all the features you need for a job such as this, and are relatively inexpensive, especially when compared to having to hire someone to have this done for you.
Note that you should only try this last step for new installations. If you would like to do it you will also have to change all the table names inside the database.
However, I advise that you see this set up the Login LockDown plugin in place of any.htaccess controls. Login requests will stop from being allowed after three failed login attempts from a certain IP address for one hour. You click to read can get into your admin panel whilst away from your office, and yet you still have protection against hackers if you do so.