WordPress and Subversion on Mac

Few things you need to know

– I’m not a native English speaker
– I’m new to Stack Overflow
– I’m new to Subversion

What I’m trying to do

I’m developing WordPress themes & plugins and never thought of using Subversion until a few days ago. I’ve downloaded Versions and read all the documentation on their website. I’m trying to use it for plugin development, but I don’t understand how.

I know how to create a repo, import, checkout, commit. I just don’t know how to use all this for plugin development (or themes, or anything).

So I got MAMP, a few sites in my htdocs folder (WordPress mostly)
and Versions. Let’s say I want to work on a plugin, on
website_one, what exactly should I do? How does this all work?

What I’ve tried

I tried creating a repository on my desktop, importing the whole wordpress_one site, checking out a working copy of it, modifying things and all but how do I work with that? How do I preview my changes?

Should I only import and checkout the plugin files? How do I see what I’m doing? I don’t know if you understand what I’m asking for. I feel lost, I feel like I don’t understand Subversion.

Any help would be very much appreciated!