Looking For 2 Plugins

Hi,

Hopefully somebody can help me out. I’m looking for 2 plugins. New to wordpress so I’m mostly relying on plugins and not so much the coding aspect of things.

The first is something that can automatically detect who the author of a post/article is, and put a twitter follow button up top.

Like this:

https://fansided.com/2015/02/07/nba-trade-deadline-10-players-need-new-team/

And the second plugin I’m hoping to find is something that can do a scrolling/fixed sidebar, similar to this one:

https://grantland.com/features/worst-mlb-contracts-2015-alex-rodriguez-ryan-howard-prince-fielder/

Any help would be greatly appreciated.

Thanks in advance,

Nick