Adding Web Hosting through Wordpress at OVH after already having a domain

I am currently customer of OVH and I have two domains there. These domains are used for email accounts which are steup through microsoft outlook. I now want to also have a website over this same domain. In order to have a cheap easy to use solution, I was thinking about wordpress. I have been searching a it and saw that OVH offers the web hosting package where the domain is included. I am a bit unsure. Ihttps://www.olansies.com will receive a new domain where my wordpress website will run or if I can make it run on the already purchased domain. Furthermore, I am a little scared that downloading the wordpress package will delete all the email account set up I did with microsoft outlook. Does someone have experience and can help me out here or indicate a post where this topic has already been discussed?