Neither of these are correct. You should use "Is there anybody" or "is there someone". Both mean essentially the same.
You should say "Hi everyone". The word "anyone" is used in questions and in sentences where we use "not", for example. I did not see anyone in the room. Do you know anyone who's good with math?
'Kind regards' is the correct phrase. The word 'warm' can be used to suggest that something is friendly and pleasant and kind but for this particular phrase it is incorrect.
Learning anything can be fun, but with language it can be incredibly rewarding when you find you can communicate with new groups of people, or watch movies or TV from another country without having to read subtitles. A good way of making learning a language more fun is to do it with other people - either other learners, or with a good teacher who will find out your interests and tailor the language learning to you.
It is difficult to predict, however some estimate that even within just a few years, between two and three billion people will speak English to some extent. Yet once the figures get that high (total human population is estimated to be 7.7 billion people), the rate of increase will soon decline, since there will be fewer and fewer people yet to learn the language. It is likely that by 2050, around half the world's population will be able to speak English.