Hello,

Adobe stopped supporting flash for android since ICS. You may still be able to download the latest (old) flash player "at your own risk" from Adobe archived flash player versions:

http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html

Please read the disclaimer at the end as it is not advised to install unsupported flash versions.

As for video streaming, there are lot of apps for that and it's just a matter of your preference.

Hope that helps

Note that while some popular sites like Youtube and Twitch still works with Flash 11.1 and the 11.2 on Linux, many sites have since made it so you need a more current version. I encounter this on some news sites for example.