Question 1. Is it possible to grow on a window ledge? using natural light/darkness.. if so how strong will the smell be inside the room 2.

Answer 1,Don't bother with this method it's not worth it or the time

Question 2. if growing outside amongst normal plants how strong will the smell be (I have bad neighbours)

Answer 2,the smells can be detected for a distance (not sure how far)but bad idea if you live close to them

Question 3. How much space do I need to grow in a room (I cant dedicate a whole room to it)

Answer 3,Each plant you grow needs atleast a 1 SQ foot of space