You'll need to get a fan, ducting, and a carbon filter most likely. The initial investment is always more than most people think but its worth it in the end to have clean medication that you know is 100% legit. You'll also need nutes and decide what type of soil/grow medium you're going to use.
For that size tent you can do 2 bigger plants or a max of 8 plants in 2 gallon felt grow bags. I have a tent that same size maxed with 8 mothers but I am constantly trimming them back. They'll last about 6-9 months before they are completely root bound.