Plbab:
I second Casey's recommendation. This is a great book. It gives an overview of the major methods of building benchwork, has lots of very detailed pictures and diagrams telling you exactly how to put it all together and then has some information about how the benchwork integrates with scenery and prototypical trackage. With this book, and a little experience, you can build good benchwork. Heck, even I can build good benchwork with this one!
Don’t know of any websites that compare to this $12 jewel.
Good luck, from the ground up.
Ted