There are a ton of free learn japanese podcasts that I like using. Especially if you're only aiming for listening comprehension and oral communication, I think podcasts would be a great way to learn. The best one that I've stumbled upon is JapanesePod101. They have free audio lessons every day and a variety of proficiency levels (newbie, beginner, intermediate, advanced) and bonus "premium" content for paying subscribers. You should check it out! It really helped me to get exposed to the language and culture.
Another helpful one is Learn Japanese with Beb and Alex. It's less formal and classroom-like than JapanesePod101. The host of the podcast is much more fun and casual with his listeners which makes the podcast more entertaining.
If you're a big anime and manga fan, there's Learn Japanese @ Japancast. It's more or less centered on anime and manga. But it's not nearly as structured as the previous two podcasts that I mentioned.
I hope that helps and がんばって! (good luck)