You do not need a website builder. You need an e-commerce platform, since your end goal is to sell online. Therefore beyond the visual storefront online and the customization you want, you need a backend:
1.) connecting to payment provider
2.) process orders
3.) sends invoices
4.) keeps track of your inventory
and more

Although WooCommerce has proven quite useful in the past and still today many shop owner use it, I would definitely recommend Shopify (shopify.com)

The reason is Shopify is an all-in-one service provider when it comes to e-commerce solutions. It is the Swiss Army knife of e-commerce shops so to say.

You not only get beautiful templates out of the box that you can easily edit with a drag and drop editor. Even more important sometimes, you get a premium server infrastructure with a team taking care of any necessary updates and technical issues, defending the servers against cyber attacks and making sure that every shop can scale from 1 user to 1 million users.

When people choose Wordpress + WooCommerce they focus on the free aspect and forget they need hosting and have to figure it out themselves. Also since Wordpress is completely open source it is more vulnerable to hacking, since hackers can study the whole code. Since Shopify is a business it also keeps its core code to itself and while advanced users can modify almost everything with code it does not allow users to modify certain vulnerable areas for this very specific reason.

If you want to build your online shop fast and focus on your business and less on the technical side I would strongly recommend to choose Shopify. They have a 14 day trial (no credit card required). The options might look a bit overwhelming at first but they even have a wizard to guide you through the process and a free online academy:

https://www.shopifycompass.com/

Finally the plugin you would need to customize your product options is:
https://apps.shopify.com/best-custom-product-options?surface_detail=custom+product&surface_inter_position=1&surface_intra_position=1&surface_type=search

If you need any more help just give me a call.

All the best

Gerd TF