Unless you have a thick carpet, get out your strap for supporting the endpin of your cello.

Seated on your chair with the cello in front of you, feel the tuning peg of the c-string behind your left ear.

Tilt your cello slightly to your right, so that you can't see your left leg.

Here you can download a summary of these introductory videos.

And here you can download an illustration of the anatomy of the cello.