1) Get some CFLs. I get them at Walmart for about $8 each for the big ones. The squished down cone-shaped ones are bluish and good for vegging. The column-shaped ones are warmer in color and better for budding.
2) You should get more blades to the leaf soon. One of my plants went right from 3 blades to 7. Another went 1-3-3-5. Same age, different strains. Be patient.
3) HELL NO! Those incandescents are why they are stretching so much! Go to Walmart and spend $20 on some CFLs! Skip buying a bag of pot this week and invest in your future stoniness!
4) Do it! Some natural light is better than none! Plants have had millions of years growing under the sun- our electric lights are a poor substitute for the real thing (at least until you get into the higher ranges of HPS, etc)
5) Miracle Grow is not that good for cannabis. Try running a search here on it. Don't skimp on soil- get some good stuff!
6) Just barely! Personally, I grow 2 plants in each of my three 19 gallon "rubber maid"-type tubs (Walmart, $4). More room is better!

Good luck- Granny:hippy: