Do I need CDN? What else do I need with new e-commerce website

Hi,

Total newbie and working on my e-commerce website which will cater only 1 country as of now and will have 20,000 of Image approximately.

I made website via woocommerce + wordpress + elementor + oceanwp theme because I am always cheap and can't think of paying shopify anytime soon .

I don't know what else to do to finalize the website before launching online. I did all the appearance thing and payment plugin.

All I need now is to add images gradually in a process and create categories of pages.

Any more tips on how to finish the project.

Thanks