My advice (from a non magick standpoint): just start doing things.
For singing, take singing lessons if you feel you must (as stated above), write songs, record covers. keep practicing… until you feel confident in sharing your creations and then put them out there; and then keep practicing!
Same for acting, analyze scenes from your favorite movies, watch acting vid tutorials and tips on youtube, do stupid videos with your friends, even just to play around and experiment. Nothing is too small a step. Once you’ve got a few projects under your belt, small or otherwise, create a backstage account with a resume if applicable and get your name out there!
That’s one of the key big things: getting yourself out there. There’s a saying that succeeding in the arts is based on “who you know” That’s only half of it, its also based on who knows you and who is reminded of you in a room of people looking for talent.
Implement these steps along with your magick, use them for you own required practice of going into the arts along with taking the necessary actions to forward your magick into this reality, and you’ll be on a good track I think. This is what I’m doing, I’ll be out of film school by the end of spring, I’ve got a similar want. It can’t hurt!
I think I’ve got a few videos on acting and stuff stashed away somewhere, If I find them I am PM them to you!