Reddit reviews Lithuanian Children's Book: Bilingual ABC's for Lithuanian-English Speaking Children
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There's an app/website called Memrise which I've used a bit to some success and also http://www.oneness.vu.lt/ which was created by Vilnius University for learning Lithuanian. Both are free. There's also some small tutorials on YouTube and an app called Pimsleur, but I haven't used that.
As /u/Foteno said you can try some children's books and such. There are some books that I know of on Amazon which are a dual English/Lithuanian children's books. https://www.amazon.com/Lithuanian-Childrens-Book-Bilingual-Lithuanian-English/dp/1533506663 is one.
I don't mean to discourage you, but if you don't talk in Lithuanian constantly this will be almost impossible for you to learn. It isn't easy even if you live in Lithuania. If you want to simply say a few words then the sources in my first sentence should suffice I hope.
Also maybe try /r/languagelearning
Good luck!