You have a big rote-learning task in front of you with all the character meanings and pronunications. Characters are systematic and aren't as hard to learn as it seems. However, with Mandarin you have to rote-learn all the pronunciations with tones.
Tones are super important if you want to be able to speak. There is no way around this but memorization. So it is just a task you have to do every single day with books and flashcards and such. It is only a matter of putting the time in, starting as soon as possible. Just study whenever you have a free moment. There is a flashcard app called Pleco that seems quite good.
Then you have the grammar. Chinese grammar is pretty simple and logical, so there is nothing much to worry about there.