I need help with my deck

Hey guys. I’m new to Pokemon but I want to start out strong. I’m thinking about starting a Fire and Dark type deck. Is this a good idea?

First of all, unless you want to drop 300+$, I wouldn’t explode into power. Take it a little slow. Second of all the competitive decks aren’t type based, but strategy based. In the current meta there is 2 dark decks and one fire deck that you can look into (they’re probably even on this site) The fire deck is volcanion and the dark decks are yveltal ex zoroark and darkrai garbodor girirtina

I hope this helps