1. You are learn with the alphabets. Once you can fluent with alphabets, slowly you can learn many words. It would always be better to follow the method of reading first, then writing. When you feel that you are familiar with the words, you can form sentences. You just think of a sentence and try to write the same sentence in English. There could be some mistakes. But you should not bother about it. But, you have to write the same sentence using many different words till you are satisfied with your sentence. If you follow this way, very soon you can create sentences of your own.
2. The next step is learning the grammar of the language. It is quite simple and very systematic compared with other languages. There are certain rules and regulations for each and every topic in grammar of this language. As long as you follow the rules and regulations, it would be a difficult task to make mistakes. You would gain that much guidance from the grammar.