I assume you mean heroes to start learning the game with? Try learning how to support with crystal maiden, lich, and vengeful spirit. They'll give you a good understanding of how a game is progressing while also teaching you lane control, warding, roaming/ganking, and how to pull creeps. Once you have a grasp on those heroes you could try easy carry heroes like viper, drow, mortred etc. I wouldn't suggest middle until you have a good grasp on what most heroes do, what items do what, and how to setup lanes.
edit: I did it again... ffs.
Also I have a question for you guys, do you think that winrate reflects skill, or can winrate be increased by taking advantage of the system somehow? A solo queue player with 52% win can be just as good as someone with 65% win who generally only plays 5 mans or party, yes or no?