I am an elementary student from China, and I want to learn English to communicate with my pen pal. How do I do it?

Hey, everyone. I live in China and am in 2nd grade. Recently, I got a pen pal in the United States. This is really a bigger opportunity for me to learn English. I am still in the stage of learning English elementary words. I don't know how far I can learn English. At present, the biggest difficulty is that I cannot communicate with my pen pal in English. Now I communicate through translation software. This is a bit embarrassing. Everyone, do you have any good suggestions?