A little more info on your setup would be helpful and get you more accurate responses.
So far as perpetual harvest goes, there are several pretty solid perpetual harvest threads on this site. An idea of what kind of space/wattage/strains you have to deal with.
Methods can/will change with more space/light. I currently run a semi-perpetual harvest in a stealth grow. 250W, 2 plants harvested/month for ~2-3 oz's.
Lots of good info here at RIU, and some tremendously helpful people with a cumulative millenia of growing experience, a bit more info and i am sure you can get all the tips you need.