Studio mains powered flash
This is where for most people it gets scared. How do you meter, using mutilple modifiers, just where do you start.
Well I would suggest watching a few YouTube videos as a start, then book a good local studio.
If you live in Lincolnshire, Nottinghamshire, then I would suggest you book Worksop Photographic Studio. The above shot was taken there.
Book the studio for a couple of hours and the house model and get a lesson on lighting. Many studios offer courses and you will learn a lot.
The key thing is to learn how to meter, and about soft and hard light, and specular and defused light.
The bigger the light source in relation to the model the software the light. Things like soft boxes give you more defused light then something like a beauty dish which being more direct and specular light source.