And if you do end up gettin the bigger grow box/tent you can use the lil one for clone/seedlings or a mom box!
As for nutrient you should start with something easy like the two part "FLORA NOVA" 1 Bottle for grow, and 1 bottle for bloom, supper concentrated stuff so will last a long time, and as you go along you can start to add supplements like FLORALICIOUS PLUS, KOOL BLOOM and things like that.