You can start studying everything that interests you at the same time. Even if it seems that some knowledge and skills are not needed now, do not hesitate - they will not be superfluous.
Well it depends on your goal. If you want to travel, for example, then English is your best friend and should start learning. If you want to make money or be a freelancer, then, again, English is an option, but the field of it, web design, and so on is more promising. In general, a strange question, whatever you study, it may be useful to you in the future, depending on what you want to do. Try everything and bet on what gives you the most pleasure