Decentraland is open to the public as of today, Feb 20, 2020.
Here are some instructions that may be useful for beginners.
Feel free to share them, provide feedback or comments
https://docs.google.com/document/d/1r2gn4g4Lk_W6AKfQBkpszwhrftP9GetbMwmwm4ZjQvU/edit#