OVH provides a FreeBSD install out of the box. But I don't like the default partitions layout and I redo it. You can reinstall in advanced mode (where you can set partition) from the OVH manager. There is also a netboot that you can use to boot from the network, log via ssh and then install or repair the server. That is useful when things are broken.
I use FreeBSD on a kimsuffi (currently a kimsuffi 2G) since years without issue.
For the rest your question is too vague, there is a lot of things in the FreeBSD handbook (
handbook) and in the manual pages.
We will be happy to reply to your questions if they are more specific anyway and if we know, of course.
Regards.