1. Repot when it needs it. Growth will slow down and it'll drink it's water very fast. Checking the roots is very easy, just be careful to not break apart the rootball. Once the roots have circled the bottom a couple times, transplant.

2. Could be nute burn. I think MG compost has fertilizer already. If you are starting from seed, it could be too much. Should start with a seedling soil for seedlings.

3. Depends on how much is in the soil. Look for deficiencies and then add fertilizer (nutrients) when watering.

4. Yes, but not much there to smoke. Better to start again if you have a male.

5. From the preflowers. Google cannabis preflowers, plenty of pics. The preflowers will show 4-8 weeks from seed, or about 7-10 days after switching to 12/12 light cycle.

All the info is around here, just gotta do some searching. Those are the short answers, but they only scratch the surface. Read, read, and read some more.

Happy growing :jointsmile: