Seeds: It all depends on the strain. Some cost more than others, but for starters, I suggest using bagseed, or, getting from a low cost seed dealer like Nirvana, so, for seeds, anywhere from free bagseed to $100.

Nutes, soils: Buy a big bag of soil, like, 15L bag, for about $5 or so. Nutes are something you don't have to buy all the time. I've had the same container of nutes that I started with, and I still use it, so 2 or 3 diff. kinds of nutes, anywhere from $10-$50. I suggest you use a medium or soil mixture of your choice to lighten the soil. Use Vermiculite or Perlite. A bag will cost you $3 or so.

Lighting: A 400W hps setup will run you at least $250.

Materials: It all varies. You WILL need a fan or 2 to keep things cool, and possibly and intake/outake fan as well to keep temps low, so anywhere from $50-$200 I'm guessing.

It all varies. It all depends on what kind of setup you choose to use to keep things cool.

A rough guess would be $300-$500. The lighting cost the most to start off with but pays off in the end.