Welcome to DA! I've been around for six years now so if you have any questions don't hesitate to ask I leave here some suggestions on things you should do:
Groups: I think being in a group is the best way to show your work to others and meet some great artists. I encourage you to visit this:
ProjectComment. It's designed to bring quality feedback to the artists and the admins couldn't do a better job, it's full of interesting activities and lovely people.
Forum: another easy way to share your work! It's really intuitive and it has helped me to discover amazing artists.
Llamas: I'm leaving one for you, just because they're awesome.
That's it, but I leave here this
New Member's Guide To deviantART and you can ask me anything. Enjoy your time here!