Welcome to FishLore! It's great to have you with us! To get you started, click on the "FishLore Articles for Beginners" link in the beginners forum. That will help you understand what cycling is all about, and give you a heads up on what this hobby entails.
Freshwater tanks and saltwater tanks both pretty much start out the same, they just have different ways of doing things, but have the same general principals. Saltwater tanks also need to be cycled. Freshwater is good to start with because it is much less expensive to start with in equipment and fish. Plus you don't have the added worries about salinity. Nitrates are also more carefully watched in a saltwater tank. Freshwater is just less worry, and it's probably easier to solve a problem than a saltwater tank would be. Usually a water change in a freshwater tank can solve a lot of problems.
I hope you learn a lot while you are here, and please visit us often with all your questions!