Home of the Ultimate Xbox 360 Modding Tool, Horizon. XboxMB.com is a community of Xbox 360 gamers and modders who share Tutorials, News, Reviews, and other resources. Xbox Message Boards is free to sign up and use, so what are you waiting for? Register Now!
Horizon uses DotNetBar, a suite of controls for Windows Forms (part of the .NET framework). What type of program are you looking to make? Different languages are better suited for certain types of applications.
Really the best way to get better is just from practice. I'd suggest constantly having projects to work on. Also, watch lectures on YouTube every now and then. Top notch universities such as Stanford and MIT put some of their lectures on there for everyone to watch.