Whos a good hero to start with?
I played dota and lol.
Also, whats a good item build?

Almost everything is situational. Learn the hero roles (carries, supporters, initiators). Try not to get stuck with the easy invis heros (scout, nh even though nh is awsome if played/picked in the right moment).
Start off by playing some no stats matches to get the hang of it.

then you should know there is no "good start hero"

Start by asking yourself what role you want to play

Play hammerstorm