Hey friend, looks like you're off to a decent start!
I'm nearing the end of my first grow and I have to say, don't be scared of LST/tying down your plants a bit. I'd recommend to get some gardening ribbon. The wide (1/2") green stuff. It's pretty easy to tie off and it stretches a bit. Just gentle and little at a time. I waited until I had the 5th node showing before starting to pull branches out to the sides. Some people like pipe cleaners too.
I have a 2x2 tent and it is tight in there but I am only going to run one plant at a time. Base your tent size on how much space you have and how many plants you want to grow at a time.