So im a League of legend player and i want to trt Hots but i don't really know where to start...
its so different , is there a website or something that could help me

best thing is to do the tutorial just practice with chars a good free champo right now is jaina and also a good support is rehgar then do some quic matches will be easier as you go
find some streamers on twitch\

you can hop on mumble with us and I'd be happy to help

Outside of that build guides can be found here
http://heroesofthestorm.github.io/idream-tierlist

Guides on top of anything else can be found here but I highly suggest the above link for build guides
http://www.heroesfire.com/hots/wiki

Thanks

just play 20-30 games and get a tiny bit of experience under your belt. The best way to learn is by playing.