SSH should work after install. Now you can not use root to ssh in with without a change
if you are out side the network need to make sure port 22 is open on the router.
Post examples of what you are trying to do.
errors you are getting.
Please don't open up root unless you only use certificates to log in and preferably limit the IP address range via the firewall for access to SSH at all. There's good reason to leave root disabled otherwise.