Frame size 640×480.
A CRT TV has 480 lines of vertical resolution and is 1-1/3 times as wide as it is high. 480 × 1-1/3 = 640

Bitrate depends on what the video’s like.
e.g. lots of action? lots of colour gradients? lots of low-light scenes? All of these will make the video more difficult to encode and may require a higher bitrate for good quality.