Welcome to Coastercrazy!
I would suggest doing some exploring. Here's a few things you can check out.
The exchange
This is the backbone of the site. Find some tracks, preferably any that are 7.0 rating and up, and get some inspiration for your own rides. Also, don't be afraid to upload your own work! Just be sure it is your very best and not rushed.
The forums
Clearly you have already worked your way around this. As you get into the community, you will find these very useful. I know I use it a lot to advertise tracks, and ask questions. The people here are generally very nice and willing to answer your questions. Be sure to read the descriptions to make sure your posts are in the right place.
Your profile
You changed your avatar, so you already know a bit about the profile. Make it your own, because people will click on it if they want to see tracks from you. If you want to make custom avatar, PM a staff member and they can help you.
Have fun and if you have any questions, feel free to PM me.
I can see you're a little bit familiar