Make sure you look at the #tutorials category if you haven’t already. The Infinite Flight Youtube channel has many helpful tutorials as well.
I would also suggest making a tracking thread, which I’ve linked the tutorial to below. If you don’t know, a tracking thread will help you apply what you’ve learned and will get pilots to fly to your airport so you can get more traffic. Hope this helps! If you have any questions, feel free to PM me :)
Edit: Obtaining Trust Level 1 is very easy, just be active on the forums, contributing, liking, replying, and you’ll be there in no time