Hi and welcome to the forums.
Congratulations on your decision to get to where you want to be.
The best advice here is really: DO, DO and DO again, or as we say here Practice, Practice, Practice some more.
You made a good choice buying the course. It will certainly kickstart your practice regiment. It will tell you what to practice and how to practice it correctly. It will not substitute practice, it will only eliminate the trial and error of figuring the right way to do things. This will save you countless hours of practicing the WRONG way, hours you can now pour into practicing the RIGHT way 😀
Obviously spend time to build a nice track collection (don’t fall into the digital DJ nightmare of “let’s download any and all music I can find”) and get to know the tracks in your collection intimately.
Finally, once you feel you have mastered a certain level of technical fluency (i.e. you can manual beatmatch pretty decently, you know how to do at least a few different transitions, perhaps know how to apply FX here and there), it’s time to go OUT and play. The real art of DJ-ing is knowing what to play next. And knowing what comes next is a combination of skill, experience and reading your crowd. All those things can not be obtained in your bedroom practicing but only by playing out in front of real people.
Good luck on your journey and you are at the right place to ask specific questions or share experiences.