Where to find some ideas...

CBBC - this is from the mainpage at the BBC - loads of shows to use - search youtube for openings:

Here's the equivalent at CITV

Try Nick

you can also look at:

Cbeebies
Disney Channel

REMEMBER you can look at different GENRES of children's TV but you MUST NOT  research a NEWS SHOW  (like Newsround) as it is the topic for the exam and therefore cannot be used for this assignment. You can also decide on different TARGET AUDIENCES - so different ages.
You can also look ONLINE if there are any web tv shows you know of.

GOOD LUCK