If you pollenize your female plant with pollen coming from the male plant, you will get A LOT of seeds from a single female plant

if no, then you wont get seeds, but you can always clone a plant, kinda difficult and need to be experienced tho

and im not totally sure but i think the weed does continue to grow, but when your growin indoor you dont want your plant to become huge. plus, its hard to get the buds without hurting the plant. so its best to start a new grow

hope itll help