>How do you download and install linux programs? Nothing that I downloaded and
>installed doesn't work, linux version or not. I need help on doing this.
Try a package manager first. It has a huge list of software available for your distribution, and can automatically download and install the programs for you. In Ubuntu, look for Synaptic Package Manager.
>Where is the system information
sysinfo isn't installed by default, but you can install it through Synaptic.
>internet information
Look for "Network Manager".
>command line
"Terminal".
>Are there things I need to know about linux. I want to learn the linux
>interface in a simple and easy way.
The fastest way to learn stuff in Linux is by necessity. Set goals each week for what you want to accomplish, then research what you need to do and attempt it. You can also check out the Gentoo and Ubuntu wikis, which are extremely informative. In my experience though, Google tends to be the best resource. There's also a Linux version of it, if you're interested:
http://www.google.com/linux