Welcome to the forum.....
You have all kinds of directions you can go with a 55gal tank especially with live plants.....
Here is a link to a 55gal I setup in Oct...(
I need to update the pics)....lol....this maybe can give you some ideas....
http://www.bettafish.com/showthread.php?t=84915
What kind of lights do you have and what kind of plants do you plan.....
I would recommend that you go to the pet shop that you plan to buy the livestock and look at what you like-write down the names and then research them to see if you can meet their needs....
Look forward to pics once you get it setup....