I have found the hard part of infinity is focusing on one faction or sectorial. The diversity of factions and models within factions is massive. The rule of cool is a great place to start playing this game, find what you think looks cool and play that. The best advice i can give anyone is stick with it, Infinity is not a easy game, it is complex and multi layered. Learn your chosen faction play 20+ games with a list. use the various forms of media that are out there that help new players go in the right direction. And remember a basic model can kill the best model in the game at any time if your not careful.