Hi,
I don't buy much gear as I'm still using gear from 30 years ago, but when I do buy, I usually goto REI. You will get decent gear there as long as you are weight conscious. Going lightweight is more about what you leave home than what you take.

I'd suggest going on some local hikes before going overnight. Take all your gear and hike in a couple miles. Set up your tent, cook a meal, and then come back.

Sometimes the freestanding tents can be difficult to set up. Search on YouTube for how to set up the Hubba. Practice at home a few times.

Your pack may be a little big. Don't take it back, but don't fill it either. It's easy to add 20 pounds of extra things you do not need.

If you see a forecast for rain, sleep out in it. That way you will know if your tent leaks.

Above all, have fun