Potential new customer enquiry

[KevinW]

Hi
I currently have DN and hosting with an ISP and have email tied to this for my primary use and also have a couple of DN and hosting with another company and am looking to consolidate my hosting services to one provider and OVH was recomended by a friend.
I am unsure which service/s I will need to fulfill my needs. I would be looking to host a 2 - 4 sites using my DNs and have separate mail boxes for each DN. Will I need to purchase a hosting plan for each DN or one plan and maybe an email solution? All are for personal use with one maybe being used for work in the far future.
If I move my DN and email which I currently have with my ISP, how long does the process normally take to setup and be running?
Any advice would be greatly welcome.
Thanks in advance