Please watch this video. This explains everything you need to know :)
Link to video: https://www.youtube.com/watch?v=VDsjXB-BaE0
Some more detailed information:
- Automatic first chest claims are disabled
- You start out with 100 claim blocks, and you get 100 claim blocks per hour you are online
- You stop getting claim blocks you have 10000 accured (unused) claim blocks.
- Claims expire after 60 days inactivity. Claims where hasn't been built in expire after 1 day.
- If you have more than 12000 accured claim blocks your claims will no longer expire/
- You can get over 10000 by deleting a claim
- PvP isn't possible inside of claims.
- Pets are also protected outside of claims
- Explosions are allowed/enabled inside of claims (except for creepers)
- Claims extend 64 blocks down into ground (from where you use your shovel)
- They go all the way to the build height limit from there
- Claims need to have at least a width of 2, and an area of 6
- You can't have more than 64 induvidial claims. If you hit this limit look into claim subdivisions.