As seedlings I'd be giving them one of the veg time scheme's - 24/0 or 20/4 or 18/6. My preference is 18/6 as it gives a decent dark period for the plants but its a personal choice for each grower. Whatever you choose though stick with it until your ready to flower and change to 12/12. Don't forget if you buy lights or have them already to use a colour suitable for veging plants, that is something in the blue range (6500k). If your getting pots too, try not to get something too massive for them (small plants = small pots) that will make caring for them much easier. All the best mate I hope it works out for you all