Can we get sunnah from spreading the word about islam, or by guiding someone to Islam?
Giving Dawah is definitely the sunnah of the Prophet ﷺ, but its ruling is that it is Fard, i.e. Fard al-Kifayah.
ولتكن منكم أمة يدعون إلى الخير ويأمرون بالمعروف وينهون عن المنكر وأولئك هم المفلحون
And let there be [arising] from you a nation inviting to [all that is] good, enjoining what is right and forbidding what is wrong, and those will be the successful.
قل هذه سبيلي أدعو إلى الله على بصيرة أنا ومن اتبعني وسبحان الله وما أنا من المشركين
Say, "This is my way; I invite to Allah with insight, I and those who follow me. And exalted is Allah; and I am not of those who associate others with Him."