I need clarifications on the writing "WILL"
1) Can anybody write a "WILL" about the course of action should be done after his / her demise.
2) Is it required to be Registered. If yes, where it should be "Registered"
3) How to inform to family / friends about the WILL documents.
4) What is the validity of the WILL. Is there any expiry date for the WILL
5) Can individual write one or more WILL
Please amplify .