OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.LSL.LSL_BaseClass.cs contains a s*load of empty functions. These are all the LSL-functions. And all needs to be implemented. Implement most important/most used first.
There is a “World” object available (scene).
Example of implementation:
public void llSay(Int channelID, string text)
{
World.Something.Somewhere.SendMessageToEveryoneAround(channelID, text);
}