Little help needed please :)

Okay so I'm growing two critical mass strains in my greenhouse. The plants are about a month on and I think they're doing okay but I'm just wondering about when I decide to flower if I should just let the seasons naturally flower her or bring her inside for 12 hours a day in complete darkness.

im not an expert, but i would wait for them to grow more, also if you can you should move them to a bigger bucket

Are they indoor or outdoor? Oudoor, mother nature will decide for you, indoor, depends on the size of your flowering space. Realize when you flip to 12/12, they will stretch to appx 3x their current size so......how big is the flowering room? With just 2, I imagine you could veg them good and long, get them nice and big b4 you flip 'em.

Lendel is correct, time to get them in their final pots (3gal min IMO)

Okay so they're actually in a greenhouse. I open the door during the day for air circulation and the light breeze. That pictures a bit deceptive in relation to size. I've recently just transferred the plants and those black pots are about a foot long and over half a foot in width. Still too small?. here's another picture at a different angle.

Yes, very familiar with the pots. You want a 3gal or better but you still have a good 2-3 weeks in those before its an issue, let them adjust before transplanting them again.

Mother nature will take care of triggering for you, being in a greenhouse. Refer to the outdoor section, those guys can help you better with the specifics