DOTA 2 Lifestealer - A versatile yet slow hero
Do you know who creeps around? The Lifestealer creeps around. This intro will give you a good idea on how to play this DOTA 2 hero.
'Jungling' - the DOTA2 playstyle where you stay away from the Lanes and level up by attacking the monsters in the Jungle - is quite an easy way to get into DOTA2 if you pick the right hero. The Lifestealer with his Feed ability can stay in the Jungle from lvl1 to later emerge in the lanes causing grief.
Lifestealer is slow though so perhaps not the easiest starting hero in the game as he requires you to know his cool downs and mana regeneration very well. What he is though, is fun and unique to play.
I'm currently playing this build from Dota Fire, it's easy to follow and with the Armlet+Rage Lifestealer is a force to be feared - dishing out serious damage.
A note on the Armlet: monitor your health closely and don't turn it off when you are really low on health. Go attack some monsters in the jungle and regain your health.
Also, learn to time your Infest - very useful, fun and gross.