Forum:Machines, Zombies, or Discard?

Right, well, I stopped playing Yugioh about 2 years ago and just recently decided to get back into it. I went out and purchased some structure decks and played with my friend who got me back into Yugioh. Well.... I comepletly trounced by his stupid Frogs (can't think of anything more humiliating.) I really want to win against him but I can't with the decks I'm using. I'd also like to be able to go with him to tournaments to play so I need cards that are legal.

So here's my question/s. Which direction should I go deck wise? Or more accurately, what cards would go good with the following deck ideas? I'm so out of the game that I feel really lost. Frog Friend recomended this site for help. So here're the deck ideas.

Zombies: Focusing mainly on abusing Zombie World.

Machines: Focusing on ramping a ton of Machina monsters or Machines for raw power.

Self Discarding: I really want to abuse Forced Requisition or Skill Drain, but I don't know how to keep them in play, or garuntee getting them each game.

I'm sorry if this is in the wrong posting area, I'll move it if I need too. Sorry if my question's are too vague, I'm still newbish.

Thanks in advance