Good answer...Just want to clarify your request. You are going to empty your bedroom, I'm assuming, and turn it into a grow room while you save enough money to build an extension to the bedroom itself or a separate room?
I guess my answer would be to break it down into separate sub systems. You have environmental control meaning HVAC install. This will include heating, cooling and humidity control. LIghting. No need for explanation. Irrigation.
Are you going to house mothers? Will you have separate veg and flower chambers? Are you trying to setup a rotation schedule for perpetual supply?