Hello my fellow brony, welcome to DeviantArt! I noticed your new here and figured I'd say hi. To help get you started I made a small list of groups you might be interested in joining based on some of your interest.
prittylittleponies.deviantart.com
bronies.deviantart.com
ponies-for-everypony.deviantart.com
Groups are a great way to socialize with others who have similar interest as you. You can find more groups by going to the "MORE" tab next to the submit button at the top on the page.
You should also visit the following pages. They'll help you get settled in:
dawelcomewagon.deviantart.corockstarvanity.deviantart.com/…forum.deviantart.com/devart/we…If your having trouble or have a question you can visit the "Help and FAQ" under the "MORE" tab. And don't be shy to ask others questions or ask for advise.
Hope you enjoy your time here!