The cheap PH pens are really risky, I'd recommend getting some liquid tester to double check your readings or get a more reputable brand like Bluelab or Hanna.
Everyone I know that starts growing catches the bug and wants to have another few plants going while they wait on their first harvest to ripen. On that note, you might want to check out the perpetual harvest tents.
Or even this one. If you want the veg/flower areas. Add a Mars 300 (flower side), a 2' T5 fixture (veg side), 4" inline fan and carbon filter, and some duct tape to make sure the divider is light-proof, and your off to a good start.