i would say thats good for a start up, but youll need a bigger light with a 70 w hps you wont be able to do much i think you need at least a 400 w if you only use 1... i would recomend you to strart growing 1 of each kind, so you get it, in how to grow weed... since you are a total newb you have to learn before you hit the big leages...
Good luck