Don't feel stupid - lack of knowledge isn't stupidity. We all had to learn.
Been a while since I looked at OpenSuse but it had good doco when I did - try opensuse.org
for a start - click on "Discover it".
For a server install, a deliberate decision must be made to *not* install a GUI. So you will need to install it yourself. OpenSuse uses (at least) two tools for installs - from the CLI, either "yast" or ""zypper" should work. The former would be better in your case. Once in a GUI environment, yast is the normal update means. See the wiki for doco.