well that all depends on how much you want to spend. Start by getting better, or even just the correct lighting, depending on what you are even using now. next invest in a light timer, so it takes the human error out of the plants natural light cycles. Keep temp constant. this can be a challenge depending on your lighting. keep between 75 - 85 degrees. next, transplant those girls to bigger pots and better soil. My suggestion, use fox farm ocean forest. also my personal opinion use no less that 3 gallon container per plant. Now you will need to purchase nutes for your girls, another IMO, explore the fox farm nutes line. Also buy some PH up and PH down solution along with a PH tester. A PPM meter wont hurt either. Knowing when to harvest is importaint and the curing process done correctly can be a challenge for new growers. Do your own research, do A LOT of reading. Rolling a few jay's up and spending a couple of hours on this site exploring every day is actually the best advice I can give you.
Good luck and happy growing my friend.
I recently adopted some strain of kush TBA. Bought a tent 48x24x60 to fit into my one room apt. And put half outdoors in random clandestine locations cuz I don't have a yard 
They're in basic Cape cod shitty soil and I have no clue what to do to raise my adopted children in this dysfunctional family