yo man, for a one plant indoor grow youre doin really well. id stay away from incandescant (round) bulbs. They give off too much heat and the plant cant really recieve that spectrum of light. Instead, try using 4-5 6500k watt cfl (compact flourescant blubs, same bottom, but a swirly design) these bulbs not only put out a light spectrum that the plants can recieve and let off a fraction of the light, but the bulbs are energy efficient as a mutha! Now, if you had the money id say you need to bypass the little money and get up here with the big boys and grab a 400w hps.
but since im high im assuming u live under somebodys roof by the lack of materials so im going as cheap and stealth as possible. The plant looks good for a month, but she/he is about to explode in height, so read up on LSTing and FIMming before its too late. Judging by the pictures, it looks like you have a INDICA dominant plant, start doing your research on this specific strain, you should be able to plot out a timeline as to when you want to harvest the plant, but judging by the looks of the plant coupled with being planted or germinated(?) in july, id say another 3 months or so. You CAN start introducing nutrients (nutes) into her system, but if you do start at 1/4 the recommended dosage and work your way up. Nothing hurts worse than nuking a plant because of too much nutes
your typical lighting schedule should be something like 18/6 for veg and 12/12 for bloom. Dont fuck with her light schedule or she'll go hermie and then youve got a whole new plant! Im lifted and im rambling but i think ive just about covered the first three months of growing these little beauties. Rep the info if you see fit and ill be around for anymore questions if ya need a brotha. Great job manm youre doing swell!