First off, unless you have a secret source, you can't get wrought iron anymore. You'll have to settle for forging mild steel. Wrought iron is just too expensive to make.
It's really hard to learn blacksmithing from a book. There are some good books out there. I like "The Art Of Blacksmithing" by Alex Bealer. I also often check out the books by Cosira from my local library. They go into detail on making gates, anyway. I assume you mean plant pot *stands* - I saw a bunch of forged pot stands in Europe recently. There isn't much to making those, once you get good at drawing tapers and doing scrolls and collaring you can make anything like that you want to.
Furniture is wide open, and advanced (difficult) work. I doubt you'll find much out of a book. But try your library!
Most blacksmithing books are bought cheapest at Centaur Forge.
Grant Erw> Hi,