If you’re new to it, go for Wallace T Wattles first is my strong advice, and suspend disbelief long enough to really try his methods. All his books are out of copyright and can be found online, The Science Of Getting Rich teaches methods which can be used in other contexts, and The Science Of Being Great is also applicable to all sorts of things.
I put some suggestions here for generally finding where to start in the huge field of magick, and with all the different ideas and paradigms out there: Introduction - now what? - #4 by Lady_Eva