Several things you should know about editing:
1. Always use the most popular anime, especially if it's from Cartoon Network. It's what everyone wants to see. No one ever gets sick of it, and that's why it's popular. If possible, leave the Cartoon Network logo on your footage, so everyone knows that you support them for airing your favorite shows.
2. Edit with DivX. Alot of people will bitch and whine and tell you not to do this, but it really saves a ton of space on your harddrive, so you can fit even more footage in your video, ultimately making it much better in the end, because more is always best. Also, it leaves a cool DivX watermark on your video, so when people see the logo, they know that they're able to watch it with the DivX codec.
3. Use lots of FX. In fact, use as many as possible. The less recognizable your footage is, the better. Now I know some people will bitch about your videos not having stories, but they're just old bitchy geezers. Stories are a thing of the past, and no one like them anymore. No one wants any of that "sit around the campfire and tell stories like a caveman" shit. This is 2007. This is the future. And in the future, you need lots of FX. Like that movie, Back to the Future: Part 2. They showed the future. It was full of special FX.
Besides, no one watches anime because it has stories either. Anime just looks cool. Take Inuyasha for example. It's an awesome show, and everyone loves it, and nothing even happens in the story for a good 200 episodes! By adding FX to your vids, you're also improving on the anime itself. If they could afford it, the animators would have completely covered up the animation with awesome digital FX.
4. Make lots of threads about how to improve your videos and perfect them. It's vital to spend as much time talking about AMVs and their processes as possible. You need to discuss all their most vital secrets and philsophies, so that by the time you actually get around to editing, you'll be a super-pro.
Ask lots of vague questions in this matter, and you'll get some surprisingly specific answers. People on this forum are always happy to share their vast cornfields of experiece with you, and you can leech that experience from them by reading what they have to say. Leech their experience like juicy nutrients for your budding skills. Then when harvest time comes, and you actually edit, your videos will be ten times as awesome, because you spent all your time preparing your mind and your mantra for it. It's best to actually edit as little as possible in practice, because that's not where the skills come from. It's all about from learning from others, and that's why this site exists.
I hope I've helped you in this regard.