Nutrients

Soil, coco,dwc?? As there's next to nothing to go on, I'll assume soil. I'd say Plant magic hard or soft water soil grow nutes, depending on your water quality. Or if going organic Canna bio vega and flores. Feed with vega/veg nute as soon as the leaves at the bottom start to fade, or before but as it's your first I'm not gonna suggest guessing when to start. Wait for a sign, and do 2-3 ml per ltr, good luck. Word of advice mate, start a diary when you start your grow, makes it easier to deal with problems if you can look back on a plants life and see what it's been fed etc : )