bahamutzero

I am trying to plan out my first grow and ive done a ton of reading on these forums and also the cannabis cultivation growFAQ. I still have a few burning questions tho! If these questions seem stupid or you know of posts answering the same questions I apologize but im just a newbie trying to absorb as much information as possible before my first grow attempt.

1. How much ventilation is really needed for a 400w HPS light in a 6x4 closet, will i be ok just opening the doors during light cycles? Also should i be worried about heat from the light being an issue in this type of space?

2. My first grow I was planning on just going for one plant, how worried should I be about odor problems? (I live in an apt building..) I know it matters on the strain I choose and I was thinking about WW or Juicy Fruit or some Diesel. I'm aware that Northern Lights is obviously my safest bet but if i chose one of the first three will i be freaking out my last few weeks of my grow when it becomes the smelliest?

Thanks in advance for any advice this extremely knowledgeable community has to offer!

Edit: Also if any of you veteran growers can remember your closet growing days and feel like warning me of common pitfalls that might come up given my noob status and choice of a closet grow location please let me know!

BL