Terms and Conditions to enter “The Grid” you find at Metropolis grid when you create an EYE-Avatar via http://sb3.hypergrid.net or the Wooden Mannequin Avatar.
You have to be older as 18 years even there are just pieces of art to see. If you are younger ask your parents to create an avatar and that they shall stay at your side when you look around. You may first have a look at a school project PRIMEXPLORER where kids between 12 and 14 years learned to built in opensimulator.
How to start using the keyboard and mouse you find in this short videos:
How to walk at: https://vid.me/7YHW
How to use camera at: https://vid.me/nLtI
What you may experience in this world you see best in the machinmas of WizardOz Chrome.