Unity3D Multiplayer with Photon

I'm planning to make a MMO games. Many people suggesting to use Photon Server. and i have a questions about it

1. Does Photon can be programmed in JS ? (most of it are Photon.cs, but my game script mostly use JS)

2. I use Mobile Broadband (which mean it doesn't have a static IP address), does it problem with my game / server if i shutdown my computer? (sometimes, the IP address can change if i restart my PC)

3. How to make each player shares their character info ? (such as health, rank)

4. How to make it the player controls own character not other player character ? (Making a respawn I'm sure it's an instance of player prefab which have if Input)

thanks for any answer