Do you learn most easily from books, from hands-on, or from mentoring through examples? Different people learn differently, so that will matter. (Some can mix-and-match, too, of course.)

If books, I recommend going to a good bookstore or library. Before you go, write a list of questions you actually find you need answers to on the subject. Grab a stack of books, and try to find answers to your questions in each book. What you'll probably find is that one or two of the books will "resonate" best for you. The writing style, examples, narrative-sequence, etc., will allow you to get the most out of them. Then pick those.

If hands-on, get a copy of SQL Developer Edition, install it on your computer at work. The employer should provide it, not you. Then start building proof-of-concept work in it. Try something practical but easy. Perhaps the online tutorials, perhaps something more personal or more closely related to your employer's needs.

If mentoring, and there isn't someone in-person at work, then you'll probably spend a lot of time on SQL forums (like this one).

But the first thing to do is think back to your education, and experiences in other fields than just DBAing, and work out your best learning pattern. That's where you should start from.

Does that help?