I assume you're talking about shell commands, as any graphical SVN client has pretty straightforward options for this.
I use these steps to do the first check-in of my files (as I am a self-taught newbie, this may not be optimal, but it works):
- Create a new repository in the web panel
- Enter the shell and navigate to the directory your files are in, then go up one level (cd ..)
- Execute this command:
svn checkout http://your.svn/repository/ directory
("directory" has to be the directory your files are already in).
- Add all files to version control:
svn add *
svn commit -m "Initial commit"