That you must do. I used to be pretty good with flash, but haven't used it much in the last 10 years or so. I got that way only by experimenting. I used electronic flash of low and high power, and flash bulbs. They each give different effects. As good as I was, I wouldn't be comfortable using it now without some familiarizing practice again.
You need to know how each type of light works in different situations and what light they produce. One photo with each isn't enough. Are you going to use a digital or film camera? Use what you will there.
Also, be yourself as much as possible, and remember you are being paid to shoot what your customer wants, or as near as possible. Eugene Smith was indeed an accomplished photographer and printer. You are not him, which doesn't mean you aren't any good, just that you likely have a different style. That is what you are likely to produce your best results with.