you can do allright in a box that size. The height will be your limiter. If you learn about LST and SCroG you can do quite well in a small space.

Going from seed each time can be very time consuming, nt to mention dissapointing if all come out as males.

Build a box with 2x2's and plywood. Mylar or panda plastic the inside. Get some good extraction fan and the right lights for the space. Have a section of the box set aside for mother and clippings. Have a small veg area and you can then run perpetual harvest.

There is a ton of info here and some really helpful and knowledegable folks. There are also the others to read enough to know.

like I said before have fun.