1) I don't have a version of MD 2010 installed but there should be a ( + ) plus sign directly below the left side bar in the lower margin of the Moneydance window.
Click on the ( + ) plus sign to open a form wherein you can select various items to add or remove from the left sidebar.
2) It sounds like the split window has somehow been collapsed.
Hover your mouse cursor over the bottom edge of the split window title bar. (the bar with the Moneydance icon, 'Edit Splits' and the 'x' on it) When the cursor is over the bottom edge of the bar, the cursor should change to a double-facing up and down arrow.
At this point hold down the left mouse button and drag the cursor downwards. Doing so should reveal the hidden parts of the split window.