When starting to communicate with your readers; first and foremost is to build trust and credibility. And one way to get that credibility is by telling them something about yourself, skills you possess and anything about you as if selling yourself to the market.
Your reader’s impression reflects on how you present yourself through writing, which reflects your personality even from behind the monitor. That’s when credibility builds up.
If you want to strengthen the trust, the least you could do is state some personal thoughts about yourself, the concept in that is you trusted your readers with a bit of your personal stuff therefore in return they’ll pay you back the trust you gave them.
Since it is your debut in writing, there is no specific rule in creating this topic, just let everything flow out of your mind. Remember the two words, Trust and Credibility.