Lighting will be the most expensive investment in this hobby, and you want to get good lighting the first time around.
Your options are: t5, metal halide and LED
t5 and metal halide will require you to purchase new bulbs every year, but are the cheapest up front. LED are more expensive upfront, but have less impact on your electric bill and dont need to be replaced.
with t5 go for a 6 bulb fixture with individual reflectors. I have a 4 bulb fixture and I find it limiting and i dont really like it.