Basically yes, I would like to create a hot wallet, but didn't really think that it is called "hot". Are there any tutorials or resources how to make an Electrum-based hot wallet on server?
If you install any full, funded wallet (be it core, electrum, btcd,...) on an online webserver and use it to automatically handle payouts, it is per defenition a hot wallet.
You can find info about the json rpc interface:
http://docs.electrum.org/en/latest/merchant.html