Completely new to dota 2

i have completed the tutorials, read the most of glossary and saw my friends playing dota 2, i could say that i also learned something from them too but now im struggling with my position + hero to main. My friends told me to get bristleback and play offlane but i dont think offlane is a good role for a new player as i see mostly experts play offlane. Can anyone help me with the hero i should main and the pos i should play?