Are you new to Dota? Stick to Co-op with bots then. The Dota community is one of the most elitist communities in gaming, very noob unfriendly.
f you want I have a TL invite which I'm willing to part with.
Cheers
You can also try Viper, Bone fletcher, Shadow Fiend (raze may be a bit difficult)
Zues is pretty easy to play. I would say try him out