Side note: it's easy to get overwhelmed in this game as a new player, I can't even imagine starting now and trying to catch up. Look at all these characters as long term goals, not something you have to have right now. Work towards the ones that are worth the effort, paying attention to what is required (you need a 7* Home One to get a 7* Chimaera, for example). As long as you can win regularly in arena and fleet arena today and are working towards improving your roster for tomorrow you're in good shape.