You can find out rules by follow the rules link up top. What else would be helpful? Please let us know.
LARPIng has its own language. Adina has put up a good basic glossary at https://fairescape.wordpress.com/larp-terminology .
There are a lot of skills that will help your LARPing. Lizzie Stark wrote up a nice pithy piece about them: "How to Become a Better LARPer".