I was in the same situation when I first came here, 23 year ago. I spoke Spanish, and knew English only applied to science, but none conversational.
Someone gave me a piece of advice that I still recommend to people. Watching TV is a great way to learn, specialy sitcoms. It is a short situation that starts and resolves in 30 minutes, but it exposes you to different accents and idioms. You can write down what you don't understand and then ask. I am sure many people will be willing to explain it to you. I was working with a chinesse Dr who spoke Mandarin, Spanish and Portuguese and wanted to learn English. We decided every night which show we would be watching each night and the next morning got together for 15 minutes to discuss what he didn't understand. He learned a lot.
Do you get much American TV? Few years ago I visited Brussels and Gottenburgh and was very surprised to find mainly American TV. Very few local shows.
Maria