a little more detail for ur grow space , how many plants u want , how big a yield ur looking for ?
basicly , the chepest way , is get a cfl 6500k or 2700k , soil , pot , water , fan and let it grow .
thats the cheapest way , but u mostly likely get a 1gram or 2grams at most .
the basics for a good grow is :
a) light - approx a 100w CFL light per plant , 6500k for vegg then switch to 2700k for flower .
b) nutes - vegging and flowering nutes .
c) fan - is good for air circulation , simulating the wind so that the plant will get stronger , and cooling down the plant / light bulbs .
imo , if u dont know what to do next , then probably u havent researched it enough .
i recommend u get ur reading on the newbies section , theres some good growing guide .
https://www.rollitup.org/newbie-central/937-how-grow-marijuana.html