i could spend a while giving you tips on what to do next time but it might take awhile.. so im going to give you some tips to maybe save that grow and get a 1/4 ounce of bud......
1. you need more light... i saw someone mention the 45watt cfls.. they are great for a first grow and produce very little heat. they also can be bought almost anywhere.
2. fill in those pots with soil as much as you can,, you need to strengthen those weak stems up
3. you are going to need to have variable height. right now your light is fixed in a position.. you are going to need more vertical height.
4. it looks like you are being a little generous with the water (drooping leaves) just water it when the first inch or so of soil is dry
5. get the plants closer to the light.. you can see how your plants are stretching to get to that light,, long stems dont make bud,, you want tight nodes so adjust the height as they grow bigger... if you go with a 45watt cfl you can put that light as close as 1"
6. beware of summer, it looks to me like you are in an attic crawlspace,, and those spaces get hott
7. paint the area with a flat white paint
8. when you get the stems strengthened up turn that fan around and blow it directly on the plnats,, it will help to further strengthen the stem and provide a continuous flow of new air (and CO2) for the plant to intake