You may already know this but I just want to put it out there. Spells can not alter dna structure. Spells cant change your eye colour, Fix your nose, Make you taller, Change you into an animal, Or Change into a vampire or werewolf.
With that being said. I would start off by researching all the many different paths. If you find one that you like that is great. There is lots of books,research,videos and websites on many of the paths.
I also would like to recommend Modern Magick by Donald Michael Craig, This book was a lifesaver REALLY, it helped me alot. I also have a link to a pdf if you are interested so you can read it right away without downloading it.
I would also suggest get three books. One/ a dream journal, right down all the dreams you find important. Two/a daily journal, You record how your day went things bothering you. Three/ The last book use for spells. But only put the spells in the book if you are satisfied with the result and you liked the outcome.
before casting any spells learn how to ground and I would also suggest think over situations and outcomes of those spells. View from both sides pros/cons and stay neutral and balanced.
Also learning a divination tool would be great as well. Whether its tarot,runes,scrying,astrology,tea leaf reading,palm reading ext. Last but not lease meditation is a great tool to learn as well.
I hope this helps :)! If you would like that book or have any other questions please don't hesitate to ask.