My time has come!!

Websites:

YiddishPop - http://yiddishpop.com Requires Flash. This is a great resource. You should use it.

Yiddish Word of the Week Tumblr Archive http://yiddishwordoftheweek.tumblr.com/archive

Both Der Arbeterring and YIVO offer (paid) online classes.

Yiddish online dictionary lookup: http://www.cs.uky.edu/~raphael/yiddish/dictionary.cgi

1000 Most Common Yiddish Words (haven't checked this list, can't vouch for its full accuracy) https://1000mostcommonwords.com/1000-most-common-yiddish-words/

Yiddish.biz http://yiddish.biz/ - This is a decent beginner resources but the learning material does have a few errors in it, so be careful.

http://www.yiddishculture.org/basiclesson/html1.htm

Another online Yiddish dictionary: http://www.yiddishdictionaryonline.com/

Mango Languages has a Yiddish course that should be free to access through your local library.

Books:

The (Updated) Comprehensive English-Yiddish Dictionary https://www.amazon.com/Comprehensive-English-Yiddish-Dictionary-Gitl-Schaechter-Viswanath/dp/0253022827/ref=sr_1_4?keywords=yiddish+dictionary&qid=1557276655&s=gateway&sr=8-4 Ever wonder how to say "e-mail" in Yiddish? How about "transgender"? It's all in here.

Born to Kvetch - Michael Wex https://www.amazon.com/Born-Kvetch-Yiddish-Language-Culture-ebook/dp/B003J4VE0O/ref=sr_1_1?crid=MI2RSWY63K7S&keywords=born+to+kvetch+by+michael+wex&qid=1557275929&s=gateway&sprefix=born+to+kvet%2Caps%2C129&sr=8-1 Wex is one of the greats in the field

Yiddish: An Introduction - Sheva Zucker https://www.amazon.com/Yiddish-Introduction-Language-Literature-Culture/dp/1877909661/ref=sr_1_1?keywords=sheva+zucker+yiddish&qid=1557275966&s=gateway&sr=8-1-spell

College Yiddish - Uriel Weinrich https://www.amazon.com/College-Yiddish-Introduction-Language-Culture/dp/0914512269/ref=sr_1_1?keywords=college+yiddish&qid=1557275955&s=gateway&sr=8-1

Podcasts:

Vaybertaytsh - a feminist Yiddish podcast http://www.vaybertaytsh.com/

The Yiddish Book Center's The Schmooze https://www.yiddishbookcenter.org/language-literature-culture/the-shmooze

Music:

Yiddish Princess https://www.youtube.com/watch?v=thlOVsY-2TM&list=PL2CqZe779Hv8HDTb9633P9d9Q7qPXGwr1

Daniel Kahn (has a huge collection of songs both solo and with his band, including this Yiddish cover of Hallelujah: https://youtu.be/XH1fERC_504 )

Amalia Rubin's performance of Der Rebbe Elimelech on a Mongolian TV talent show: https://youtu.be/ANVa-Jh1dMg

More if I think of any later.

EDIT BECAUSE I SOMEHOW FORGOT the online comedy duo YidLife Crisis, including the Greatest Episode Ever guest starring Mayim Bialik: https://youtu.be/A2QlWFSakaM

Your best option is to start with a textbook like Uriel Weinreich's College Yiddish and a dictionary . Also another good dictionary . and then move on to simple books which you can find here . Eventually you'll get to some speakers, local groups, or Yugntruf or find some local Chasidim. There are a lot of people speaking Yiddish, you just gotta know where to look!

EDIT: there's also good places online to hear Yiddish being spoken, like the Yiddish Forward Youtube channel (they have a nice series of someone literally sitting in a chair and reading Sholom Aleykhem stories to the camera if you dig in the uploads) or the myriad recordings of the Lubavitcher Rebbe speaking in his distinctive Litvish dialect.

https://www.amazon.com/Easy-Shmeezy-Guide-Yiddish-Moshe-Sherizen/dp/1614654506

http://yiddishacademy.com/teach-yourself-yiddish/

https://www.amazon.com/College-Yiddish-Introduction-Language-Culture/dp/0914512269

go for it if you really want. I took it in undergrad cause I had previously learned german. Know that it is a dying language, and outside of wooing some grandparents it really hasn't been all that useful. This book is gonna be your best bet: https://www.amazon.com/College-Yiddish-Introduction-Language-Culture/dp/0914512269