Forum:Need help updating my first-gen deck to current Yugioh

Sorry if I'm using the forum wrong, I just joined a few minutes ago. But I have a deck consisting of only first generation Yugioh cards. I've been building my deck for competitions and realized the harsh truth that I needed to update my deck to fit current Yugioh. Problem is, I have no idea what I'm doing. I try to watch the anime, but I know the cards are not exactly the same as they are on the actual card, and frankly, I'm not too fond of the new animes. I just need some explaining on a few things. Clarification of Xyz's, Pendulum monsters, and anything else I may have missed. I have a dragon deck and wish to continue that way. Thanks