couple questions
1. how tall would a plant get of just one seed???
2. Is it still possible to grow some dank even if you don't have all the fancy equipment?
Bobby,
The best part about marijuana is that it's a weed, and weeds will thrive in many different conditions. The question is how potent do you want it? If you want to grow some diggity dank stuff, you are going to have to spend a little cash. However, don't feel as though you have to run out and buy they fanciest lights on the market or the most expensive equipment. There are plenty of people who grow really good stuff by just getting creative. If you don't mind growing some mid grade or lower quality stuff (or you just want to grow it simply to see if you can grow it), you won't need as much equipment, you won't need to spend as much money, and you won't have to spend as much time tending it.
I'm going to answer your questions (a) assuming you are going to start out by growing a small amount (1-5 plants), and (b) that you want to grow some quality stuff.
If you have a height constraint, there are plenty of ways to get around it. First, you should get a high output fluorescent light. (I use a 2 foot 4 bulb light. two of the bulbs put out a blue spectrum and the other two put out a red spectrum). The HO fluorescents are great because your plants can grow right up to the lights without getting burned. Also, you won't be using as much energy. Fluorescents have com a long way in the indoor world, and they are the least expensive. Next, there are a few ways to control the height of your plants. Your first option is to top them so the grow more outwardly (like a bush) than upwardly. Next you can bend them (know as training) so they grow closer to the planter. Look up Low Stress Training (LST). I prefer the low stress training because there is less shock and recovery that the plant has to undergo and that means shorter time until harvest. Anyway, there are plenty of threads on this website dedicated to both methods, and there is an unlimited amount of info on the web as well.
Is it possible to grow dank indoors....? Absolutely, but you are going to need to do a lot of research to grow it well. If you can get your hands on a few clones, thats the good way to start. Also, many seasoned vets prefer to grow in soil rather than hydro, which is much less expensive.
Thing you will need to have a basic understanding of before you start:
The importance of lighting and light cycles,
Plant feeding,
The law,
growing mediums,
PH of your water and how to easily adjust it
It may seem daunting, but it really isn't that hard. A good place to get ideas is to read the posts in Newbie Central. Good Luck