Depending on what you want to do if you want to make a video of yourself and friends. All you need is a video camera or web cam. Editing software like Windows movie maker and a mic. Then after some editing just go to your Youtube account and upload.
If you want to do like i do just post fan made videos and amvs blablabla you need clips,editing software,music and its ready to upload
Which it all depends on how complex you want to make your videos. My first vid i ever posted was a slide show now i'm actually posting them with high quality video clips
there are several ways to get clips if you want to go that wrought you can get a dvd ripper and your set but there are other ideas too.
In general it depends on how much you are prepared to spend
Well you should go to google,then type Camstudio and then it will apear and it should show a website or something but i went to google and downloaded Windows Movie Maker.Whitch one,Camstudio,Windows Movie Maker,or both.