well easiest to set up and learn to use is livestream.com and suign the procaster tool, however it doesn't provide good visual clarity for the audiance
join.me is naother good and easy one, but has no audio (take back what I said about livestream being the easiest join.me is)
I have been using hit box ofr gamign and the rare "art" stream but its a pai nto set up OBS for it

so I would suggest for starters join.me, unless you really really want audio then use livestream.com

http://join.me is a good one - people also like http://picarto.tv which is a lot like lifestream.
join.me can be seen on mobile, whilst picarto cant.
Basically, you could toss a coin which one you want more, personally. o3o