If you want your music on Spotify, you can use a distributor like MusicDigi. They take care of licensing, distribution, and paying royalties. Simply sign up for a MusicDigi account, upload your cover art and tracks, and they'll handle getting your music onto Spotify and other major digital platforms.
Once your music is up on Spotify, you can verify your artist page through Spotify For Artists. This allows you to edit your picture, bio, and other details.