I have zero experience of streaming, but if I wanted to how would I go about it? I would use twitch for this... but don't understand how.

Here is my pc spec - I am boxing 5 using isboxer.. main window on good settings, rest low:

i7-7700K 4.2GHz Kaby Lake, RX 480 8192MB GDDR5, 32gig ram

Would I be better off with a second pc/laptop for the streaming? Sorry I am clueless haha