I'm currently building a paludarium as well, mine will be a little more natural as far as where the land meets the water. By that I mean there's no glass or plexi dividers, just some driftwood, little bit of great stuff, and some mesh. I plan on having plants that like "wet feet".
the sites nick mentioned are great and will give you all kinds of ideas and helpful information. the best advice i think i could give is to plan plan plan. picture what you want in your head, draw it out, even if it's rough, gather your materials, then piece it together in a rough layout, and then start your build. If things aren't exactly what you wanted, roll with it, sometimes it just works out better that way. Good luck!