Just get a USB interface and you're good to go with what you have.

Many of the youtubes are done with webcams.

Good luck!

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Being able to play and enjoy music is a gift that's often taken for granted.

Don't leave home without it!

If you just want to record yourself live, than a decent video camera will work fine.
If you just want a decent live recording and don't need video, Tascam and a few others make nice small, easy to use recorders for about $100 to $150.
If you don't need the video and you want to add overdubs or effects, then you will need a USB or Firewire interface, as Mike mentioned. You will plug your guitar/amp/microphone into the interface then into the laptop. Be aware that recording audio requires a pretty good computer. Latency, or a delay between the time you pluck a note and the time your computer plays it back is a normal problem to have to solve. The driver you use for the interface has a lot to do with that.

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'10 American Deluxe HSS Sunset Metallic
'10 JA-90 Thinline Telecaster
'15 Music Man JP-15 Blueberry Burst
'07 Les Paul Standard Faded LCPG #82
'14 Carvin ST300
'12 Carvin CS424S
'66 Guild Starfire IV w/Bigsby
'14 Warmouth Partscaster Daphne Blue

I use the UX1 USB interface to get into my laptop loaded with Abelton Live lite. The interface comes with Pod Farm software to emulate effects etc, which are optional and fun to tweak with. http://line6.com/podstudioux1/

Here's a recording I posted here recently that was recorded with it using a Fender American Deluxe, for an idea of the sound.
http://www.box.com/s/16zrgi4q7oloxgfffqea

And something heavier that was recorded with my Charvel (before I got a Fender!)
http://www.box.com/s/f9349c9839eacab60304

Cheers

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