For your main track input/outputs there is a little module at the bottom of the strip. It may be hidden. I think you can check this in the Strips (It think that's the menu name but I'm not in front of my DAW) menu of the console. There you can hide/show various channel strip modules. As far as the sends again I forget how it displays the routing but that's where you'd look for what's being sent to what even if it takes a Right Click to look at the menu.
As far as colors showing you what's what you might want to take a look at how to use Icons to give you visual cues for stuff. Just right click on the default track or bus Icon and select Load Icon. It'll let you choose from a set of icon images, colors and graphics that came with Sonar or you can even create your own and load them from somewhere else on your computer or just save them to the icons folder. Another thing that can help is going to the Edit > Preferences > Customization (I think) > Colors and change the background/forground color of where the track name is displayed. For example I have left my tracks left at default blue and my busses are red so I know if I'm messing around with a track or a buss. There are also other options that allow you to assign colors to linked tracks and parameters but I'm not as familiar with those options. They are described in the manual.
Again... I'm still a learning myself so my apologies if I screwed anything up. Cheers.