To be honest, if you have to ask, Id stop and think about the process first.
Any place willing to sell your product is going to want clean, pesticide free and mold / mildew free cannabis. Depending on where you live, there may be a bunch of administrative details ontop of growing your weed. You may need to tag each plant all the way to packaging? You may require testing of your product? Certifying? Etc.
Now we look at your space, a decent fixture capable of producing commercial quality bud will set you back around 500 bucks to cover a 4x4 area. You will require ventilation in a big way! Depending on grow style, you may require tables or tubs, medium controllers for lighting, ventilation, humidifier/ dehumidifier. 4 rooms… seedling/ clone room can do fert mixes there… veg room, flower room, and a drying / trim/ packaging area.
You will require, led fixtures or hid your choice… for veg/ flower and you can get away with fluorescent fixtures for clones / seedlings. Although I would use led. It would be a 10,000 dollar squeeze to do it sorta proper! Trim trays, drying racks, lights, fans, ventilation, tools like ec pen/ ph pen, medium, pots, pumps maybe?
It not be cheap! And 10 grand is cheap in this game!