On a bukkit server, if you have permissions, you can do /thunder, /lightning, /smite or commands like /weather set storm to get the thunder/lightning effect. It all depends on the commands you have on a server.
In singleplayer you would have to change the weather by doing "/weather thunder"
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The only way to spawn herobrine in minecraft is to use mods as you cannot spawn him in vanilla minecraft.
Use a spawn egg in creative or look for a nether fotress where they spawn.
They just naturally spawn in jungles. Unless you're in creative, where you can use an ocelot spawn egg to spawn one in.
You can't, they are only spawned naturally. You can, however, use a spawn egg in creative mode to spawn them.