KarolOfGutovo there are a lot of guides, but ill just explain it in a few sentences here 🙂
After you've browsed through some recent events, you'll see that everyone has factions.
Think of something or an organisation that interests you. If you like medieval knights, why not a futuristic knight faction that follows old rules.
Or make a trade faction.
You make a faction by clicking the new article button on the main forum page
After you've thought of an idea, write some backstory, think of a few characters in your faction. Design some ships if you haven't. Then make an event(the same way you made the faction page). Maybe one of your ships needs help or you need assistance on a station. When people join the event, act and react accordingly.
A very good guide going indepth is Jbox1's How to make a faction. Gimme a moment to get the link