In my opinion, it's better to start with speaking and reading. Compared with English or Spanish, Chinese is easier to speak but more difficult to write. Chinese grammar is easy because you don't have to remember the tense of the verbs or the gender of the nouns. (For example, when you mention something happened in the past, you simply mention the point of the time and the verbs are always the same.) When you learn how to speak, you'll feel much interested and confident, then you can go further into reading and writing.