Forum:Starting Yu-Gi-Oh

Hi, I'm a Yu-Gi-Oh player whose is getting started again after I haven't played for awhile. I know the rules, the basics (40 cards decks blah blah blah) but I'm not sure about a few things.

A) Are my older cards still relevant? (i.e. The Monarchs, Horus the Black Flame Dragon) B) What kind of deck would it be best to start with? C) What kind of decks will I be playing? D) What are the staples nowadays?

Any help counts! Thanks!