Damn son, congrats. Lina is seriously powerful and is one of the better scaling ints because burst of her level is rare and bring that pesky carry to it's knees never hurts, I'd highly recommend learning her. If you're interested in seeing a pretty good lina then my friend (top 2% by dotabuff) plays her a lot, some of my recent games with him if you're looking for playbacks (you can click watch reply in the top right to launch it)
http://dotabuff.com/matches/144505618 (ignore the absolutely terrible medusa who almost lost us the game, god damn I hate russians)
http://dotabuff.com/matches/143660194
http://dotabuff.com/matches/143040561 (Extremely good lane/early game here)
Bonus game: Refresher tide lolololol
http://dotabuff.com/matches/146225604 . Just got a
Hammer Time so I'll probably play him all week.