Here's a great article on re-streaming...

https://steemit.com/steemit/@bhavnapatel68/restemming

As far as upvoting, you only get a certain amount of power. You start every day with 100%, and it goes down from there, so you really want to only upvote the articles you benefit or appreciate the most. You don't have to upvote at 100% power either...once you can upvote at least $.02, you'll be able to modify how much of an upvote you want to give. Hope this helps!