Regardless of what type of “style” of photography you consider shoot with it, I asked you what type of ring flash you wanted and weight.
It seems to me you done no research on it, and think or feel that a ring flash is the answer to some of your lighting issues. There are a number of different ring flashes that do different jobs. Someone on the thread as already point out macro, which I have seen in the past some nice portrait shots and work done with one of those as keeping in mind you don’t want to get in to someone face with a 300watt flash, unless you want to damage their eyesight.
Then there are 3000watt studio ring flashes, that (like all) it dependent on a generator, but are mains powered, meaning you cannot go out on location, as some fashion work will require you to do so at time.
There is then the mobile battery generator, which use a lower power ring 1200 – 1500 watt. Giving you the option of working in the studio of the battery or main and the freedom of location work.
And there are those that are lightweight enough, so if you were fly aboard to shoot, it would not cost you some much with pack in your luggage on the weight side.
The ring flash is just another tool, it will not make you a great photographer, and will not become an overnight success sue to using one, I say this because I know that many people go out and buy a ring flash as they hope it is the answer to photography of lighting issues, and then produce very flat and harsh light images, but is you are going to get one for the right reason, then make sure it is flexible to do as many jobs, and styles as possible, do you research and do not buy a cheap one.
..keeping in mind you don’t want to get in to someone face with a 300watt flash, unless you want to damage their eyesight.
That's an important point. Don't expect your model to endure an onslaught of continuous ringflash as you might with other lights. She'll probably decline to work with you ever again, or maybe she'll just strangle you. Then there's the inevitable red-eye to contend with too.
To all the comments, thank you for your input, perhaps I din't make myself clear to begin with, I was just asking for a ring flash not advice how to use it or what type I need. I'm now 58 years old I've been working in glamour, fashion since I was 20 years of age, I was an apprentice to one of the countries top calender photographers in the 70s and 80s. I was studio manager until 1992, Grew up on Hasselblad, Mamiya RZ67 and Nikon Used Broncolor extensively.