Is it possible to manage my website on my own without any web designing knowledge?

Totally. There is no need of knowing any sort of web desigining or programming knowledge. You can totally manage your website on your own.

Can I change the prices of my products on my E-store instantly?

Yes, you can easily change the prices any number of times, with a simple MS Word Editor.

Can I upload my photos, videos, and other media on my website?

Yes. You can upload your photos and videos from anywhere, totally on your own.You can also add keywords to your pictures and make your website google-friendly.

Is it possible for me to launch new products as an when I want?

WMS is a very dynamic system, you can not only launch new products but you can also send emails and newsletters making your customers aware of your new products.