Welcome to DeviantArt
I hope you enjoy posting your amazing work
Here is some tips for starting:
-You can create different Collections where you can put your art, it's like creating photo albums
-you can visit Daily Deviations & Undiscovered pages, you could find some great art you could fave, people will notice you and you could have many friends in the community
-Joining a group is also a good way to meet other Deviants
-There are various pages where you can find help