Well if it has a TV input, you should have some software on your computer to capture the video. Also if you are going to make a big video with different clips you will need some video editing software. Adobe Premiere and Sonic Foundry Vegas video are good choices. Then you can use these programs to cut bits out, add titles and special effects etc.
If you have trouble with anything computer related, we have a computers forum where someone can help you out. Just don't talk about where to get software for free, because it's against the rules here.