Good Day, Hashim and Everyone
The way I've been practicing as a beginner [I'm Left-Handed, also], I'll learn the "Card Flourish" in whatever hand position the video on youtube is showing then I'll practice for a few mins or reps, I prefer reps for example the "Charlier Cut" - I'll practice 10 reps with my left-hand, my dominant hand, then after 10 reps, I'll switch to my right hand to do another 10 reps.
Cheers, Hashim!