I want to learn a language?

My family is Sicilian, and I want to learn the language. I will teach myself, but I want to know what points I must cover. I have a Sicilian dictionary also which is great to learn the words. Please tell me what I must know in order to teach myself about the language. And, usually when starting to learn a language, they teach you easy and commonly used words at the start. Where can I find a list of these common words?