New Prestashop installation

This is a pretty quick job for whoever wants it.

I need to host Prestashop with an offshore host , I have purchased a VPS etc.
I try to install Prestashop via softaculous - but keep getting a 500 internal server error.

I want some one to manage my prestashop installation , so that the store is fully installed , able to open external url's etc - basically functional.

I'll also want a ssl certificate installed as well

We are able to do the rest , I can build a store in Presta - but am unable to alter codes and scripts in CPanel etc.

Thanks for looking