Studio FLASH is pretty much dead now. You have LED lighting that goes from low to bright when you fire the shutter, or you just leave them on.
If you are still intent on flash, you need three lights for portraiture. A focus light, higher than subject, left or right.
A soft light fill in so soften shadows lower and the opposite side to the focus light.
And a background flood. This can also be turned towards the subject and can be a rim light.
Dramatic effects can be used by reducing front lights and increasing back lighting.
Lots of help online, but look into LED. Cheaper, never fail and lighter and more portable. I did weddings and portraits for 20 years. See if you can find the book 'Making and Managing a Photographic Studio', by Robert Bluffield. He and Robert Glover trained me. Two great names in wedding photography.
https://www.google.com/search?q=studio+flash+setup+for+photography&rlz=1C1QJDB_enCA643CA644
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