Well, I'm tempted to say GRAMMAR! But grammar is useless with VOCABULARY! Of course you need to LISTEN, and READ, and WRITE(even if just practice sentences), and SPEAK! So I think you need a little of EVERYTHING. A MIXTURE! But most of all you need PATIENCE! Nobody can learn everything, immediately. A little every day, taken with a big spoonful of patience.

Hi! I've been learning English by myself for some years, but only two years ago I started speaking English. My spoken English isn't good yet, but now I know that I should have tried to speak with English natives when I was a bigginer. So I think the most important thing is 'Speaking with English native speakers" :) I hope you will find someone who will be glad to help you learn English! Good Luck!

Hello, Gabriela, I believe that the most important thing is motivation. If you have enough motivation to do something, you will find a way to do it. A good technique is to write down how your life will be better in 5, 10 and 20 years if you learn English. With enough reasons, you will find a way. I wish you the best of luck and if you need anything, feel free to send me a message.