germ and veg you use the same light cycle it can either be 24/0 or 18/6. Once your plants are big enough you can switch to flower. Your plants are big enough when you think they are. You can veg them for 1 week or 100000 years. Just know once you switch to flower they can double or triple in size. So if you have a 3 foot tall grow space you can let them grow to be 1 foot tall and then switch to 12/12 and this will force them to start flowering. When the plants recieve 12 hours light and 12 hours dark it starts the flowering stage. The flowering stage normally last about 8 weeks, Sometimes less sometimes more depending on the strain you are growing. I would leave them under 24/0 for about 1 month then switch to 12/12 and you should get a decent yeild. If you have tons of space and time then let them grow for as long as you can and then switch to 12/12. The longer you let them veg under 24/0 the bigger they get which means the more you will yeild