I dont know where to get people to duel. Do i need hamachi?

If I understand your question correctly. Are you asking where can you duel people? I also doubt you need "Hamachi" to duel.  "DuelingNetwork" is a popular site to duel and it's also free. Another place you can duel is Ygopro, its automatic,  while DN is mostly manual.

if it helps, the site itself doesn't have an onboard dueling program one can use. but to duel people on the site, simply request their DN username, and PM them on DN

(this gives me an idea while we're at it....)

Well, DN (Dueling Network), and YGO pro. I never used Hamachi before... So I can't really comment on that one.
- Well, DN; http://www.duelingnetwork.com/ It's manuel, so there are a lot of people who can annoy you by going slow, or misplays, etc,  but it's more like the real thing in comparison to YGO pro, where everything is done for you, and at times you don't understand certain plays it does, if you aren't playing close attention and/or know what your cards do. On DN you can add people as friends, and vice versa, than talk to them later, and such.
- YGO pro; It's all automated, but you can't add friends, and have to set up duels with friends you know, or duel random people, much like DN, and there are  Tag duels on YGO pro, but DN is discussing about getting Tag Duels as well. So yeah.

But im my opinion, I rather DN, since it gives you more of an experience of real game play.

Hope this helped.